Kelly Osbourne has reportedly gained 19 pounds since splitting from her fiancé.
The 'Fashion Police' co-host is said to be following a strict new diet and exercise regime in a bid to slim down again, after putting on weight since her break-up from Matthew Mosshart in January.
A source told Now magazine that the 29-year-old star, who lost 70 lbs. after appearing on 'Dancing With the Stars' in 2009, is currently on a healthy "cleanse" and wants to get her pre break-up figure back.
Kelly dated the vegan chef for more than two years after meeting him at Kate Moss's wedding in 2011 and recently admitted she wants to stay single for a "very long time."
She said: "I plan on being single for a very, very long time. No, I don't think it's possible for someone to sweep me off my feet right now."
The star was also previously engaged to model Luke Worrall and isn't sure if she ever wants to get married.
She said: "I'm really enjoying my life ... I don't now if I will ever get married. I think my views on marriage are changing, as I get older - not out of heartache, it's just that the world is changing.
"But if I ever do get married, I'm never changing my last name."

Kristen Dunst likes to have a "knight in shining armour" on standby.
The 'Two Faces of January' actress, who previously dated Jake Gyllenhaal and is currently in a relationship with Garrett Hedlund, admits she enjoys letting the men in her life take control sometimes.
The 31-year-old star told the May issue of Harper's Bazaar magazine: "I feel like the feminine has been a little undervalued. We all have to get our own jobs and make our own money, but staying at home, nurturing, being the mother, cooking - it's a valuable thing my mum created. And sometimes, you need your knight in shining armour. I'm sorry. You need a man to be a man and a woman to be a woman. That's why relationships work..."
The blonde beauty formed a close bond with her co-star Viggo Mortensen on the set of their upcoming film, but was initially "a little scared" to work with the 'Lord of the Rings' star.
She said: "He's surprisingly hilarious. The first time I met him, he was very reserved. It was in an elevator. I was like, 'Hi.' He was like, 'Oh, hi.' I learned later he was very shy. So I was nervous, even a little scared, to work with him. I thought, 'This is going to be intense.' Then I got the whole other side, which I don't think many people know. He should do comedy, I've told him that... I'm sure he wouldn't be happy with people knowing how fun he is."

Keira Knightley cheered on James Righton as his band kicked off their new tour.
The 29-year-old actress was spotted supporting her husband's group The Klaxons during their gig at the Hare and Hounds pub in Birmingham, England on Monday night (31.03.14).
A source told E! News: "It was the first time the band had played at the Hare and Hounds and Keira stayed for the night and was dancing the entire time, which I'm pretty sure is the sign of someone having a good time.
"I've heard from the small number of people who did manage to meet her on the night that she thoroughly lovely, sweet, polite and very unassuming."
The 'Anna Karenina' star managed to avoid being recognised by most of the band's fans.
The insider said: "She had arrived with the touring party and spent much of the afternoon and evening in the dressing room with the band until they went on stage.
"She then watched from the back of the venue with friends and family of the band and by all accounts remained unnoticed by the audience."
The 'Jack Ryan: Shadow Recruit' beauty and James, 30, got engaged in May 2012, after meeting through mutual pal Alexa Chung, and tied the knot in the south of France last July.

Kim Kardashian donated "loads of toys" to an orphanage in Thailand.
The 'Keeping Up with the Kardashians' star, who is currently enjoying a holiday with her family, including nine-month-old daughter North West, in Phuket, took some time away from the beach to pay a special visit to the Home & Life children's home with her mother Kris Jenner, sister Khloe Kardashian, 29, and half-sisters Kendall, 18, and Kylie, 16, Jenner.
A source told E! News they spent several hours playing with the local children after bringing "loads of toys and soccer balls and board games" to the facility.
Kris' estranged husband Bruce Jenner and his son Brody also joined them at the orphanage.
The insider added: "The kids loved it, they probably didn't have a clue who Kim Kardashian and her family are, but they loved the presents."
The family were spotted painting murals on the walls of the refuge before taking a tour of a local village.
The source said: "The girls were great with the kids. They were very motherly and attentive. Khloe played ball with some of them, too!"
The visit was filmed for the family's reality TV series.

Chris Evans credits gymnastics for helping him to get in shape for his new movie.
The 'Captain America: The Winter Soldier' star, who transformed him physique for the film, was forced to follow a very strict workout routine before shooting the blockbuster, as producers wanted him to look lean and muscular but realistic.
The 32-year-old star told Jimmy Fallon on 'The Tonight Show': "We tried to do a little bit more gymnastics. Balance beams."
He jokingly added: "I had a whole ribbon routine."
The hunky actor recently insisted he has no plans to quit acting in favour of directing, just weeks after admitting he was fed up of being in front of the camera.
He said: "By no means am I planning on retiring. It's kind of a silly statement. But I certainly am going to try to focus a bit more on directing at this point."
He added: "I said that I directed last year. I really responded to it. I really enjoyed it. I'd love to focus a little bit more on that."
Chris attempted to clarify comments he made in an interview last month, during which he said: "I've known for a while I wanted to direct. But [time] never really opens up. There's another movie to do, there's another acting job. It just got to a point where I was like, you know what - I have to do this.
"If I'm acting at all, it's going to be under Marvel contract, or I'm going to be directing. I can't see myself pursuing acting strictly outside of what I'm contractually obligated to do."

Sam Worthington allegedly tried to use his celebrity status to avoid being charged with assault.
The 'Avatar' star, who was arrested and charged for allegedly punching photographer Sheng Li in New York City in February, has been accused of reminding police officers about his starring role in the 2009 blockbuster and trying to take advantage of his fame.
During a court appearance on Tuesday (01.04.14) the paparazzo's lawyer claimed the 37-year-old Australian star asked police, "Have you seen the movie, 'Avatar?"
The photographer recently secured a restraining order against the Hollywood star but appeared in court as he is also facing assault and harassment charges.
His lawyer, Mark Heller, painted his client as the victim and also accused Sam of trying to steal his camera, according to gossip website TMZ.com.
Sam did not attend the hearing, as his case is being handled separately.
The actor appeared in court in February after he was charged with two counts of third degree assault, one count of attempted assault and one count of harassment stemming from the incident.
But a source previously claimed that he was merely defending his girlfriend Lara Bingle, 26, after she was allegedly kicked in the shin by the paparazzo as the couple were leaving Cubbyhole bar in Greenwich Village on February 23.
The actor is due back in court on May 8.

Keri Russell enjoyed a romantic date with Matthew Rhys last week.
The 38-year-old actress, who announced her split from husband Shane Deary after almost seven years of marriage in December, was spotted stroking her 'The Americans' co-star's hair as they watched the Steven Soderbergh-directed play 'The Library' in New York City on Thursday night (27.03.14).
A source told PEOPLE.com that the duo, who have been the subject of secret relationship rumours for months, are definitely dating.
An eyewitness also said they were very affectionate and held hands during the performance, before leaving the theatre together.
Speculation first began swirling in January that the former 'Felicity' star, who has son River, six, and daughter Willa, two, with her estranged husband, was dating Matthew after they were spotted furniture shopping together in Brooklyn Heights.
The 39-year-old actor admitted last month that he didn't mind being linked to Keri, saying: "That's the best [rumour] I love."
The brunette beauty announced her split from building contractor Shane before Christmas but a source previously revealed they separated last summer.
A spokesperson for the actress insisted at the time that their split was amicable and she planned to "focus on their children."

Gwyneth Paltrow and Chris Martin have reportedly been branded the "neighbours from hell."
Residents living beside the former couple, who announced their separation last Tuesday (25.03.14) after 10 years of marriage, have accused them of violating zoning laws by installing a nine-foot black gate outside their $10 million mansion in Brentwood, California and are demanding they remove it immediately.
Locals first filed a complaint about the gate with the Los Angeles Department of Building and Safety last year and are allegedly planning to sue the duo if they don't take action, according to gossip website RadarOnline.com.
Neighbours also claim that their house has looked like a "building site" since they purchased it in 2012.
One resident said: "There was always work being done at the house. I only got annoyed when the workmen would illegally park in my driveway and they hadn't even spoken to me about it."
Another insider said the 'Iron Man 3' star is "not popular" in the area because she has never made the effort to get to know people.
But neighbour Hilda McGonigle added: "We used to see Chris walking the dogs. He was a really nice guy. He was the one with the talent; she was the one just writing cookbooks. To some people, their issues might get on people's nerves, but I personally didn't care. I didn't have much time for her, but I liked him."

Ricky Norwood has been suspended from 'EastEnders' after a video emerged of him smoking marijuana.
The 28-year-old actor - who plays Arthur 'Fatboy' Chubb - has been banned from filming for two months after BBC bosses decided to "take action" this morning (01.04.14).
A statement from 'EastEnders' said: "Ricky Norwood has been suspended from the show for a period of two months with immediate effect.
"In addition, Ricky would like to apologise to EastEnders' viewers for any offence caused and for bringing the show into disrepute."
Ricky hit the headlines at the weekend after the incriminating video - which is said to show the star performing a sex act as he smokes cannabis on Skype - leaked and was touted for sale to an X-rated website.
Ricky hasn't lost his job, but action needed to be taken given that he is seen as a role model on the family show.
A source said previously: "'EastEnders' is a family soap and the bosses don't tolerate any of this sort of behaviour.
"This is incredibly reckless by Ricky given his position on a BBC family soap. He's seen as a role model.
"It's made very clear to cast members that they have to behave, especially when it comes to sex and drugs."

Rita Ora had never fallen in love until she met Calvin Harris.
The 23-year-old singer has been dating the Scottish DJ for almost a year and says she had been left in the "wilderness" looking for the right person until he came along.
She said: "There are so many things. The fact that he got something out of me that I never thought I had. Yes, like falling in love. I just didn't think I had it. I'd never experienced it before. And I was just like in the wilderness, thinking, 'Will it ever happen?' "
And the 'I Will Never Let You Down' singer says her contentment in her relationship is reflected in the songs on her new album 'O'.
Speaking to the new edition of Britain's ELLE magazine, she explained: "I didn't know what the f**k I was doing on my first album, let's be honest. I was a kid having the time of my life. And I made a party album - party and bulls**t.
"This time, I'm still having a great time, but I'm in a great, loving place. Now I want people to see you can have fun and be in love at the same time."

Chris Brown declared his love for Karrueche Tran in a voicemail she posted online.
The 'Yeah 3x' hitmaker called his on/off girlfriend - who he was believed to have recently split from - from jail to ask her to pass a message on to thank fans for their support with his new video 'Loyal'.
He said in the message: "I'm calling all my fans, letting ya'll know I love ya'll. Thank ya'll for all the support.
"Thanks for everything. The video just came out so I hope ya'll enjoyed that."
He then ended the call saying: "And most importantly, K, Karrueche, I love you."
It had been claimed the 25-year-old model had ended her relationship with Chris, 24, because she was angry about him texting other women, and friends say she is "confused" about what will happen in their future.
A source told HollywoodLife.com: "In her heart, she's still confused and upset about a lot of different things but they have yet to really sit down and talk in-depth about what happened, what they're going to do about it and where to go from here.
"She knows Chris is in jail and is paying for a lot more than violating his probation. She just hopes that this time, with his freedom being taken from him, that he learns to stay clean and sober, treat people better and learn that the world doesn't revolve around him."
Chris is being held in a Los Angeles jail until a probation violation hearing on April 23.
Being thrown out of the court-ordered anger management programme - which was extended from an initial three-month period, which Chris had completed, in light of his facing further legal problems - was considered to be a violation of his probation.
Chris' legal troubles in Los Angeles stem from the assault of his then-girlfriend Rihanna in 2009.
In a separate case, the 'Turn Up the Music' singer also faces a charge of misdemeanor assault in Washington D.C., which will be heard on April 17.

Kaley Cuoco felt like a "rock star" on her wedding day.
The 'Big Bang Theory' actress married Ryan Sweeting in December, three months after they got engaged and six months after they started dating, and though their nuptials happened fast, she has no regrets because she knows they are right for each other.
She said: "I admit it happened fast, but that's who I am. When we met, I knew he was the one. [At my wedding], I felt like a rock star and a badass. What was amazing in that room, it was so full of love. It was like nothing I'd ever been to before, and it was exactly what we wanted it to be. It was the eighth wonder of the world, the greatest wedding of all time."
The 28-year-old actress previously dated 'Big Bang Theory' co-star Johnny Galecki and though she admits working with him after they ended their two-year relationship in 2009 was initially awkward, they are not great friends.
She told the May edition of America's Cosmopolitan magazine: "It took a minute, a bit of awkwardness. By the grace of God, we became best buddies and moved on in such an elegant way. [He's] one of my closest friends. He was in the front row at my wedding, with a huge smile on his face."
Caley also briefly dated 'Superman actor Henry Cavill and was amazed at how much attention the relationship drew.
She said: "I had no one following me until I met Superman. I've been in this business for 20 years, and my whole life, I could go anywhere, do anything. There had not been one paparazzi photo of me until like several months ago. The recognition was crazy."