Jessica Alba and Topher Grace are among the celebrity guests attending Jessica Simpson's wedding celebrations.
The 33-year-old star is marrying former NFL star Eric Johnson at San Ysidro Ranch in Montecito, California today (05.07.14) and invited a few of her long-time showbiz pals to attend their four days of festivities.
The 'Sin City' actress, who starred in 'The Love Guru' with Jessica in 2008, was spotted at the couple's Independence Day barbecue on Friday (04.07.14) with her husband, Cash Warren, and daughters Honor, six, and Haven, three.
An eyewitness told E! News that the brunette beauty looked "effortlessly radiant and beautiful," as she spoke to a starstruck teenage guest.
Topher, who bonded with the bride-to-be when she guest-starred alongside him on 'That 70s Show' several times, was also there with his actress girlfriend, Ashley Hindshaw.
After the barbecue, the group boarded buses to the nearby Four Seasons La Pacifica hotel's ballroom and terrace, where they watched a fireworks display.
Speaking about Alba and her family, a source said: "They blended in with other families as they left the fireworks show. Even after a long day, they looked amazing."
It was previously revealed that the 'Sweetest Skin' hitmaker sent a strict email to her guests, instructing them not to bring any cell phones or cameras to the wedding, as they have inked a lucrative deal with a magazine to publish the photographs.
The Weight Watchers spokesperson, who announced she was engaged to Eric in November 2010, kicked off their celebrations with a rehearsal dinner on Thursday night (03.07.14) and is expected to host a final brunch tomorrow (06.07.14).

David Arquette is celebrating his engagement in Aspen, Colorado with his fiancée this weekend.
The 42-year-old actor, who proposed to Christina McLarty, with whom he has two-month-old son Charlie, on Wednesday (02.07.14), organised a special getaway to mark the occasion.
A source told PEOPLE.com: "They are going to vacation in Aspen to celebrate."
The actor, who was previously married to Courteney Cox for almost 11 years until 2010, is also set to host Aspen Peak Magazine's 10th Anniversary Celebration tonight (05.07.14) with his business partner, John Terizan, at their nightclub Bootsy Bellows, an outpost of their famed West Hollywood hotspot.
The 'Jake and the Never Land Pirates' star popped the question with a blue-stoned ring outside Mastro's steakhouse in Malibu, California, in front of Charlie and his 10-year-old daughter Coco, whose mother is Courteney, but the proposal had been in the pipeline for some time.
A source previously said: "He flew to Las Vegas to ask Christina's dad Bud McLarty for permission [to marry Christina] a while ago, so it's been in the works."
The happy news came just days after David's ex-wife announced her own engagement to Snow Patrol rocker Johnny McDaid, 37.

Scarlett Johansson celebrated her fiancé's 32nd birthday in the Hamptons.
The 29-year-old actress, who is pregnant with her first child, hosted an intimate dinner for French journalist Romain Dauriac with four of their friends at Indian Wells Tavern in Amagansett in East Hampton, New York on Thursday night (03.07.14).
The 'Her' star and the group were joined by staff members to serenade Romain with 'Happy Birthday,' before presenting him with a chocolate peanut butter pie.
A source told the New York Post's Page Six that the blonde beauty was dressed casually in black overalls and a T-shirt and also dined on a turkey burger and sipped sparking water throughout the meal.
Scarlett, who divorced Ryan Reynolds in 2010 after two years of marriage and started dating Romain in November 2012 after being introduced by a mutual friend, tattoo artist Fuzi, previously admitted it is easier to be in a relationship with a non-actor.
She said: "It is [easier], but it's more than that. We do different things. He's in the whole art-scene world. So it's nice, because we can enjoy each other's worlds, but we don't have our crazy conflicting schedules and all that other stuff to contend with."
She added: "And, you know, of course, actors, in general, they're obsessed with emotions. Although, [Romain is] French, so he's also probably overly into his emotions."

Lorde got sick during her first rescheduled gig in Perth today (05.07.14).
The 'Royals' hitmaker, who was forced to postpone her Australian tour in April due to exhaustion, halted her performance halfway into her fourth song, telling the audience at the city's Challenge Stadium that she needed to take a break.
The 17-year-old star retreated backstage after saying: "Perth, I'm so sorry, can you give me one minute? I'm just not feeling very well."
A member of her crew blamed the incident on "technical issues," but the New Zealand star suggested she was suffering from food poisoning when she returned and restarted her gig five minutes later, according to the MailOnline.
She said: "I must have eaten something weird."
Hinting she had vomited, she added: "I've never had to do that. I love you and I'm so grateful to be here."
The teenager - real name Ella Yelich-O'Connor - appeared to be in good spirits, but later took another moment to wrap a towel around her neck and admitted she "just felt tired."
The 'Team' singer has spent the last few months quietly recording her next album after pulling the plug on the tour due to a mystery illness.
In a statement via their Facebook page, tour promoter Frontier Touring said in April: "Under doctor's advice, Ella Yelich-O'Connor will return to New Zealand for immediate rest and recuperation in order to regain complete health and continue touring for the rest of the year."

Labrinth didn't sleep for four days before performing at the Wireless Festival.
The 25-year-old rapper took to the stage at the music event in London today (05.07.14), where he told revellers he'd been awake for most of the week working on new music.
The 'Earthquake' hitmaker said: "I've been working on my new album and I haven't slept for four days because I've been working on new music for your beautiful ears to hear."
But his lack of sleep didn't affect his performance and the British star, who gave a shout out to his friend and collaborator Tinie Tempah during his set, admitted he was thrilled to be there.
He said: "I'm loving this s**t."
The 'Frisky' hitmaker also encouraged his fans to pursue their dreams, saying: "If you're doing something amazing in your life don't let anyone f**king tell you that you can't. Keep doing what you're doing."
He added: "I love you London. I came here to party with every single one of you."
Kanye West, who was reportedly booed on Friday night (04.07.14) after he halted his performance to give a 20-minute speech about discrimination within the fashion industry, is also headlining the festival tonight and is scheduled to close the show in Birmingham tomorrow (06.07.14).

Kelly Osbourne is rumoured to be dating Ricki Hall.
The 'Fashion Police' co-host, who split from her vegan chef fiancé, Matthew Mosshart, in January, brought the British model to see her father, Ozzy Osbourne, perform with his band Black Sabbath at the British Summer Time concert in Hyde Park in London on Friday night (04.07.14).
Their date came shortly after a source revealed they had been enjoying an "online flirtation."
Ricki, 27, shared a number of photographs from their night out on Instagram, including a snapshot of him with Ozzy backstage, with the caption: "Backstage at the Black Sabbath gig with @KellyOsbourne no biggie (sic)"
He also shared another image today (05.07.14), in which he has his arm around the 29-year-old star, captioned: "Had an amazing time at the Black Sabbath gig last night."
An insider previously revealed Kelly had a huge crush on Ricki, saying: "They recently started following each other on Instagram. He's got a huge beard, which Kelly finds really sexy, she loves guys with beards! She's definitely interested in seeing where it goes with him."
The purple-haired star was also recently linked to Puff Daddy's stepson Quincy Combs, but a friend said their romance was casual, explaining: "Kelly is single, but she's having a lot of fun. She's been hooking up with Quincy, her really good friend lately. It's not serious but he's really hot and he's very into her!"

Fearne Cotton will never forget her "magical" wedding day.
The BBC radio presenter married her "soul mate" Jesse Wood, son of Rolling Stones star Ronnie Wood, in a low key ceremony at a registry office in London on Friday (04.07.14), and says it was "the happiest day."
The 32-year-old star, who has 17-month-old son Rex with her husband, shared a photograph of their first dance on Instagram, with the caption: "The happiest day. So full of love. Family I love. Friends I couldn't live without. The soul mate."
The blonde beauty also revealed Tom Odell serenaded them at their reception, adding: "This moment I will never forget. Than you Tom Odell for this magical moment."
The couple, who announced their engagement last Christmas and have been together since meeting on holiday in Ibiza in 2011, tied the knot in front of a small number of guests, including Ronnie.
The blissfully happy bride, who walked down the aisle with her father, Mick Cotton, in a white gown, trimmed with sparkly silver beads, also wrote on Twitter today (05.07.14): "Good morning everyone from a very happy Mr and Mrs Wood
"Thank you so much Maggie Cooke for making me my dream dress!"
The star previously y admitted she couldn't wait to marry Jesse, who has daughter Lola, eight, and son Arthur, 12, from his first marriage to Tilly Wood.
She said: "I can't wait to be a wife. It just feels really solid. I want to have the same surname. I want to feel like we've done it properly."

James Franco has hinted he had a bitter rivalry with the late Heath Ledger.
The 'Of Mice and Men' star has published a bizarre ode to the Australian actor, who died of an accidental overdose in New York City in 2008, in his debut poetry collection, 'Directing Herbert White.'
In the piece, titled 'Ledger,' he says: "There had been a time when we were up for the same roles, '10 Things I Hate about You' (Based on 'The Taming of the Shrew'), And 'The Patriot' - Funny, you were Australian and so was Mel - You were the knight in 'A Knight's Tale'..."
The poem is one of several that allude to the 'The Dark Knight' star in the new collection, which also includes a piece written about Lindsay Lohan.
The 36-year-old actor, who also recently penned a fictional short story whose central character seems to be troubled Hollywood starlet, is clearly very inspired by the 'Mean Girls' actress despite branding her "delusional."
The '127 Hours' actor was furious after his named appeared on actress' leaked list of celebrity sexual conquests and insisted they never slept together.
He previously said: "I will swear on anything that you ask that I have never had sex with Lindsay Lohan! Here's the problem: I bet you if we brought her in here and you asked her to her face 'Did you have sexy with James?' she'd say yes.
"I can't believe she put me on that private list. She's so delusional!"

Nicole Scherzinger admits she is "recklessly ambitious".
The 36-year-old star, who has been in an on-again, off-again relationship with British Formula One driver Louis Hamilton for six years, wasn't able to enjoy her success when she was a member of The Pussycat Dolls, but says she is much happier these days.
The 'Your Love' hitmaker told the UK's The Guardian newspaper: "My 20s were fruitful but not enjoyable. Being in The Pussycat Dolls was probably my loneliest time because I was quite insatiable. Nothing was ever good enough and I didn't know how to take a break. My 30s have definitely been more chillaxed."
But she added: "I'm recklessly ambitious. In America, ambition is a good thing - it's hunger, it's drive. I hate it when people use the word negatively."
The former 'X Factor' judge also admits she has always been very emotional.
She said: "My nickname at school was Crybaby. Sometimes I can cry just talking because something means so much. And when I'm really hurting I just sob - a bit like someone is dying. I'm emotionally intense."
Despite still being excited about her career, the brunette beauty is already dreaming of her retirement.
She said: "I live by the 'Aloha spirit'. My soul is in Hawaii, where I was born. It's basically having heart and compassion for others. I can imagine retiring there, wearing a muumuu [a loose Hawaiian dress] and spending my days on a paddleboard."

Khloé Kardashian has "learned a lot" about herself since splitting from Lamar Odom.
The 'Keeping Up with the Kardashians' star celebrated her recent 30th birthday with her new boyfriend French Montana at TAO Las Vegas at The Venetian Resort and Casino on Friday night (04.07.14) , and admitted she is excited to start a new decade.
Reflecting on the past year, she told UsMagazine.com: "I definitely learned a lot about myself and the strength I have as a person. I don't regret anything. I am still appreciative of everything I've gone through."
The reality TV beauty filed for divorce from her estranged husband after four years of marriage in December, following months of rumours he was addicted to cocaine and had cheated on her multiple times, and while Khloé said it was an "unexpected" time, she now feels "better."
She said: "You just have to deal with what life throws at you. Everything makes me better."
Khloé also opened up about her new boyfriend of almost three months, French.
Asked what she likes about the 'Pop That' rapper, she said: "He is just funny. He's light and it's easy. That's what I need right now. It's fun. I like how he's always happy. Smiles are infectious. They're contagious. I like that."
She added: "I just want more positivity in life."

Jessica Simpson's pre-wedding celebration was a "family-friendly affair."
The 33-year-old star, who is set to marry fiancé Eric Johnson at the San Ysidro Ranch near Santa Barbara, California today (05.07.14), held a special Independence Day barbecue to mark the US holiday on Friday (04.07.14), as she was worried her guests would be upset to miss the occasion.
The couple's wedding planner, Mindy Weiss told PEOPLE.com the festivities had "a carnival feel," adding: "Jessica didn't want her guests to miss out on the 4th of July. That's who they are. Their No. 1 concern is for their guests coming all this way for the wedding."
The stars-and-stripes themed event, which came one day after an intimate rehearsal dinner took place at the same hotel, was a family-friendly affair with games to entertain children, and guests dined on a Southern-inspired buffet, including lobster dogs, corn fritters. Smoked barbecue baby back ribs, fried chicken, mac and cheese and potato salad, before tucking into a pie bar with slices of key lime, peach and coconut cream pie, while being entertained by a jazz blues band.
Before the party, the 'With You' hitmaker, who has daughter Maxwell, two, and son Ace, 12 months, with Eric, slipped into a swimsuit and spent a few hours soaking up the sun by the pool with her younger sister and bridesmaid Ashlee Simpson, 29.
The former 'Newlyweds' star, who was previously married to Nick Lachey, is expected to walk down the aisle in a pale pink Marchesa gown in a "rustic chic" ceremony at 4pm local time.
The blonde beauty got engaged to former NFL star and Yale graduate Eric, 34, in November 2010 after seven months of dating, but they previously postponed their wedding twice due to Jessica's pregnancies.

Michelle Heaton says she may need a hysterectomy as a preventative measure against cancer
The Liberty X star has revealed the news to fans that she faces the decision of either going through the full procedure, or having her ovaries removed as originally thought.
Writing in her weekly column for OK! magazine, she said: "We had my appointment with Dr. Sheridan - the surgeon I used for my C-section with AJ - about my dreaded ovarian removal.
"He knows I like to have it straight and get on with it, but within minutes we were talking about the possibility of having a full hysterectomy instead of just having my ovaries removed."
Michelle - who was diagnosed with a mutated BRCA2 gene, and decided to have a double mastectomy to alleviate her high risk of cancer in 2012 - and her husband Hugh Hanley face the difficult decision together.
She continued: "It's such a long story and there are so many pros and cons for both options.
"I suppose the short of it is that I wish I wasn't faced with the decision of having to go through such a life-changing operation.
"Whichever procedure I do decide to go through with, it'll effect my life forever in the name of 'prevention', not 'treatment' and it's a very personal choice, and a tough one at that."