Lindsay Lohan allegedly drank alcohol at the Coachella Valley Music and Arts Festival on Saturday (12.04.14).
The 27-year-old actress, who vowed to stay sober at the event at the Empire Polo Club in Indio, California after recently confessing to having "one glass of wine" since leaving rehab for the sixth time last summer, has been accused of consuming vodka with a group of friends, including her sister Aliana, 20, during Kid Cudi's set.
An eyewitness allegedly told InTouchWeekly.com: "She looked completely out of it. She couldn't stand up straight and she was frantically chain-smoking cigarettes. In one of her hands she had a plastic cup with a clear liquid in it.
"The group was standing in a small cabana, booth type thing and one of the friends was making regular trips to the bar. I overheard the friend order four vodka sodas and when he carried them back to the group. He handed one to Lindsay and she started drinking it. She didn't seem to care who saw and none of the group seemed concerned."
The 'Canyons' star's brother Michael recently admitted on her OWN reality series, 'Lindsay,' that he was worried about her sobriety.
He said: "My biggest worry is for a relapse. It scares me, it scares my family to death. This time I really hope is different. I just want her to be happy."
But sources close to the actress insisted last week that Lindsay was doing well and hadn't had a drink since her first slip-up.

Ice Cube has blasted the MTV Movie Awards for giving the Best Onscreen Duo trophy to Paul Walker posthumously.
The rapper believes the 'Fast & Furious 6' star, who died in a car crash in November, and his co-star Vin Diesel only won out of "sympathy" on Sunday night (13.04.14), and insists he and his 'Ride Along' co-star Kevin Hart were "robbed."
The 44-year-old actor told USA Today newspaper: "We was robbed. Shame on you, MTV."
He added: "We had the best chemistry of everybody nominated, for us not to win was crazy. We were the best onscreen duo, period."
Paul was also honoured during a special tribute led by his co-star Jordana Brewster at the star-studded event.
But Ice Cube claims he wasn't suggesting the late actor, 40, wasn't talented enough to receive the accolade, saying: "They should have gave it to him before he passed away."
The actor also left the ceremony, hosted by Conan O'Brien at the Kodak Theatre in Los Angeles, mid-show because he wasn't enjoying himself.
He said: "I just wasn't into it. I have been going in and out of these things for 25 years. If you ain't into it, why torture yourself? As soon as you get bored, get up and leave."
Shortly before the awards, he wrote on Twitter: "On my way to the MTV movie awards. If me and Kevin Hart don't win. The fix is in."

Christina Hendricks has no plans to have children.
The 'Mad Men' actress and her husband Geoffrey Arend, who tied the knot in 2009, don't want to become parents but admits there is "a small chance" they could change their minds in the future.
The 38-year-old star told the May issue of Health magazine: "We've decided that we are not really interested in having children. It seems like it's expected that you'd want to have kids."
She added: "It's just very normal for people to say, 'Well, when you guys have kids...' And then when I say, 'Actually I don't think we're going to do that,' people will say, 'Oh, you say that now...' It doesn't bother me, though. And, you know, there's a small chance I could change my mind."
Christina is a huge animal lover and would love to adopt another puppy soon.
She said: "We got a puppy, and that's my idea of starting a family. People say, 'Oh, that's practice for parenting,' but if it's practice for anything it's to be a mom to another puppy."
Meanwhile, the actress and her 'Body of Proof ' star husband, 36, are madly in love and help to motivate each other to stay in shape.
She said: "We used to share a trainer. Now I'll say something like, 'OK, we need to do push-ups every day,' and at any time in the day, I can make him get down and do them, or he can tell me to do them."

WWE legend Ultimate Warrior died from a massive heart attack.
The 54-year-old iconic grappler - real name James Hellwig - passed away last Tuesday (08.04.14), just three days after he was inducted into the WWE Hall of Fame in New Orleans, Louisiana, and an autopsy has determined that he died as a result of "Atherosclerotic/Arteriosclerotic Cardiovascular Disease."
Officials told gossip website TMZ.com that the medical examiner, who conducted the autopsy, classified his death as "natural," meaning no drugs or alcohol were directly involved.
The 'RAW' star was rushed to hospital after suffering the heart attack while walking with his wife outside a hotel in Arizona, but he never regained consciousness.
Tributes poured in from the wrestling world following his sudden death.
WWE owner Vince McMahon wrote on Twitter: "We are all so sad that the Ultimate Warrior has passed away. Our heart is with his wife Dana and his two daughters."
Fellow WWE icon Dwayne 'The Rock' Johnson tweeted: "Loss always has a way of reminding us to live and love as greatly as we can. My prayers and strength to his family. RIP Ultimate Warrior."
Hulk Hogan - who hosted 'WrestleMania XXX' - also tweeted: "RIP WARRIOR. only love. HH (sic)"

Billy Joel and Christie Brinkley's daughter has thanked her fans for their concern after she collapsed on stage on Saturday night (12.04.14).
Alexa Ray Joel was rushed to New York's Presbyterian Hospital from her sold-out show at Café Carlyle, where she was diagnosed with Vasovagal syncope, one of the most common causes of fainting that occurs when the body overreacts to certain triggers, such as extreme emotional distress.
The 28-year-old 'Notice Me' hitmaker, who was at the end of five consecutive performances at the venue, released a statement on Monday (14.04.14), saying: "I wanted to thank everyone for coming out to support me. I was excited and determined to fulfil my final performance and I really wanted to end my run with a bang, but this was not what I had in mind and hope I have the opportunity to make it up to the wonderful audience very soon. Thanks for all the concern."
Supermodel Christie, 60, was in the audience with her other children, Sailor and Jack, when the incident occurred.
The brunette beauty, who was recently forced to deny she underwent extensive plastic surgery, admitted she wasn't feeling well during her performance, according to the New York Post's Page Six.
The singer - who was hospitalised after a reported suicide attempt in 2009, previously fainted "from stress, lack of sleep, and just overall exhaustion," before going on stage at Marist College in 2006.

Drew Barrymore celebrated the impending arrival of her second child at a star-studded baby shower.
The 39-year-old actress, who already has a 16-month-old daughter, Olive, with her husband, Will Kopelman, and is expecting another baby girl, enjoyed a huge bash in Los Angeles over the weekend with friends, including newly single actress Gwyneth Paltrow.
A source told PEOPLE.com: "Drew had a blast. (She is) so ready for this baby."
Other guests at the co-ed soiree included the 'Fifty First Dates' star's husband, Cameron Diaz and Reese Witherspoon, who took a girls' trip to Napa Valley, California with the pregnant actress last month.
'Iron Man 3' star Gwyneth, 41, was also on hand for the festivities despite keeping a low profile since announcing her split from Coldplay frontman Chris Martin, 37, on March 25 after 10 years of marriage.
The insider revealed that Drew is expected to give birth in the next two weeks.
The 'Charlie's Angels' star recently revealed her second pregnancy has been much smoother.
She explained: "It is easier because when you're first pregnant you're just terrified of every single thing that's happening, so this time you're busy, you're focusing on the kid, the time goes a little bit faster ... not a lot faster, but it helps."

JWoww and Snooki are "petrified" of having baby girls.
The former 'Jersey Shore' co-stars, who are both pregnant, are afraid of having daughters because they are worried they will inherit their wild personalities.
JWoww - real name Jenny Farley - is set to give birth to her first child, a baby girl, in July with her fiancé Roger Mathews, and admitted: "I'm petrified!"
She added: "Its funny because Roger will lay his head on my stomach and she will just drop kick him right in the ear. It's cute. He gets to feel it. Once we found out we were having a girl, he lost half his hair and he aged 20 years."
Meanwhile, Snooki, who already has a 20-month-old son Lorenzo with her fiancé Jionni LaValle, hasn't found out the sex of her second child, due in September, but "isn't ready" to have a daughter.
She told UsMagazine.com: "They are going to be raging crazy women! They are going to be just like us. That's why I'm scared to have a girl."
The 26-year-old star - real name Nicole Polizzi - thinks her best pal is going to be a great mother.
She said: "I know she is going to be a great mom. She took care of me for four years on 'Jersey Shore.' The whole labour thing she is really nervous about but anybody is nervous about that."
But JWoww hates being pregnant.
She said: "(Snooki) loves being pregnant right now and I f**king hate it. I'm not a fan of pregnancy right now with my thighs touching and my boobs changing but I know it will be worth it and hopefully I get back to that really quickly."

Sean Penn is reportedly planning to propose to Charlize Theron.
Friends close to the couple, who began dating at the end of last year and flew to Hawaii to celebrate New Year's Eve together in December, predict the 'Milk' actor and the South African actress will get engaged in the very near future, but insist they haven't started making wedding plans just yet.
An insider told PEOPLE.com that they "wouldn't be surprised" by a proposal, adding: "But she's not engaged - yet."
The duo, who went public with their relationship at Sean's third annual Help Haiti Home gala in January, were "inseparable" when they flew to Cabo San Lucas in Mexico for Valentine's Day weekend in February.
An eyewitness said at the time: "They held hands everywhere they went."
The 53-year-old actor is set to direct his Oscar-winning girlfriend and Javier Bardem in 'The Last Face,' which is expected to begin filming in Africa later this year.
A source previously claimed that the couple, who recently moved in together in Los Angeles, have also talked about adopting a child together.
Sean already has two children, Dylan, 23, and Hopper, 20, with his ex-wife Robin Wright, while Charlize, 38, has a two-year-old son Jackson, whom she adopted in March 2012.

A.J. McLean says Nick Carter's wedding was "bittersweet."
The Backstreet Boys star, 34, married fitness expert Lauren Kitt in an "emotional" ceremony in Santa Barbara, California on Saturday (12.04.14), and his bandmate admits it was tough watching the youngest member of the group, who went to rehab in 2005 for alcohol addiction and previously admitted he has a "toxic" relationship with his family, walk down the aisle.
The 'I Want It That Way' hitmaker, 36, told PEOPLE.com: "It was bittersweet. We're so, so proud of him. He's been through hell and back as we all have, once in our life here or there.
"And you know, we're all family. We're all brothers. To see our little baby brother finally make that big, big final step. Next step is having kids. Obviously they just got married, so obviously take your time."
A.J., whose 17-month-old daughter, Ava, was a flower girl and walked down the aisle just days after taking her first steps, said Nick's nuptials were "beautiful, rustic" and "very small."
The groom's bandmates Brian Littrell and Howie Dorough were also on hand for the celebrations, but Kevin Richardson was not present.
Nick's younger brother Aaron Carter, 26, also missed his special day, as he claimed his flight was cancelled from Washington DC at the last minute.
Nick skipped his sister Leslie's funeral in January 2012, and later claimed his family blamed him for her drug overdose.

Kim Kardashian and Kanye West have fuelled speculation they will marry at the Chateau Louis XIV.
The 'Keeping Up with the Kardashians' star spent an hour talking to staff and walking around the grounds of the castle in Louveciennes, 14 miles away from Paris, on Sunday (13.04.14), ahead of their wedding on May 24.
A source told E! News: "Kim was so happy and enjoyed looking at all the beautiful details. She asked a few questions and seemed excited to be there. She shook hands with everyone and then left with a chauffeur."
The 33-year-old brunette beauty met up with her rapper fiancé, 36, in the French capital afterwards, where they were spotted shopping at Givenchy, Balmain and Lanvin.
The reality TV star, who got engaged to the 'New Slaves' hitmaker on her birthday in October, flew to Paris on Saturday (12.04.14) to begin final preparations for their nuptials but was expected to fly back to Los Angeles on Monday (14.02.14), as she left their 11-month-old daughter North West with family for the weekend.
Kim previously revealed she and Kanye are planning a "super, super-small intimate" wedding and insisted they are both heavily involved in the preparations.
She explained: "There's certain things I'm like, 'I know you're going to hate the seating chart, so I'll take care of this,' and then there's some things that are really important to him. [But] the seating chart is like death."

Selena Gomez wants to date an older man.
The 21-year-old singer has reportedly had enough of her on/off boyfriend Justin Bieber's erratic behaviour and is seeking an older suitor who can treat her the way she deserves.
A source told RadarOnline.com: "Selena is ready to date an older man. She's grown tired of Justin's attention-grabbing antics. A permanent breakup between the two could even be confirmed as early as mid-July."
Justin, 20, and Selena were thought to be back on after the Canadian heartthrob shared some Instagram pictures of the former Disney star - who endured a stint in rehab in January - in the studio last month.
They had also briefly rekindled their romance earlier this year, despite rumours of Selena's pals and parents warning her off the pop bad boy, who was arrested for alleged drag this January and charged with resisting arrest and possessing an invalid driver's license.
But now sources are claiming the 'Come & Get It' hitmaker is fed up of strip club-loving Justin's wild antics and impulsive antics like getting tattooed at 40,000 feet above the ground on a private flight earlier this year.
The insider added: "It's the same issue they had before. She just isn't the same person she was when they first got together and she doesn't really miss the 'old Selena' much at all.
"Justin is a little bit of a crazy guy who could do something weird like proposing marriage just to keep her by his side, but that's Selena's exact problem with him.
"She really finds it uncool how he buys into his own hype, and that's why she's spent a couple of months trying to re-establish herself - and distance herself from Justin."

Miley Cyrus has given away her new puppy.
The 'Wrecking Ball' hitmaker was gifted little Mooney earlier this month by her mother Tish Cyrus after her beloved Alaskan Klee Kai Floyd was killed by a coyote, but she has decided it is too soon to care for a new pet.
Miley tweeted: "Moonie, thank you for giving me so much love, comfort, & peace. It's just to soon for me right now #missingmoonie (sic)"
The 21-year-old star admitted she was "scared" to care for another small dog after what had happened to Floyd, so had Moonie rehomed with a friend's mother.
Asked where he had gone, she told a twitter follower: "my friends mom who has a tiny pup 4 him 2 play with Molly. After wht happened Im scared 2 have a tiny dog (sic)"
Miley previously admitted she didn't feel "ready" for another dog after being given Moonie.
She tweeted: "I wanna sleep but all I can do is cry I never wanna go home to a house where Floyd isnt running & playing how do I get thru this
"I feel physically sick & I am so emotionally and physically exhausted I feel like I have nothing else to give sweet baby Moonie
"Maybe I'm not ready yet.... But being alone won't bring him back to me..... I'm at a loss I don't know what to do (sic)".