Justin Bieber's Calvin Klein photos were reportedly retouched to make his penis look bigger.
The 20-year-old singer - who has been unveiled as the face of the brand's latest underwear adverts alongside model Lara Stone - is also said to have had his biceps, back muscles and thighs enhanced by photo-editing experts.
What's more, a source connected to the shoot has claimed he behaved inappropriately on set, telling breatheheavy.com: "He was basically a douche. He hit on Lara several times and she had to stop him, basically calling him out on being just a child . . . Bieber specified he wanted to look taller and buff. Bigger bulge implied."
The claim comes shortly after Justin said his impressive-looking physique was all down to hard work.
The 'Boyfriend' hitmaker said: "I work out with my trainer, Patrick Nilsson, five days a week for about 45 minutes each. We do three days splits: back and triceps one day, chest and biceps on day two, shoulder and legs on day three, and abs every other day.
"I'm not on a special diet, but I do try to watch what I eat. I do eat unhealthy sometimes - I am a 20-year-old guy!"

James Corden isn't sure he deserves an OBE.
The 36-year-old star was honoured with an Excellent Order of the British Empire for his services to drama in Queen Elizabeth's New Year's Honours list and while he is "proud" to have been named as a recipient, he thinks there are plenty of others who would be far more worthy of such acclaim.
Speaking at the 'Into The Woods' premiere in central London, he told BANG Showbiz: "I haven't got my OBE yet. It's just been announced, I haven't got it. I'm genuinely honoured and proud.
"It's a strange thing when you're told you're going to get something like that. You're aware of how many people deserve it more than you do and you wonder whether you deserve it, and I don't know whether I do.
"But I'm honoured that someone somewhere thinks that I might."
James is already planning to take his mum and dad to the investiture ceremony at Buckingham Palace but he isn't expecting the queen to know who he is.
Speaking to Magic Radio's Jo Parkerson, he added: "I think the queen will probably ask me, 'Who are you?' ... I don't know! I've not given it any thought but I will take my parents. My mum's already fretting about what to wear."
The actor-and-comedian's latest role sees him appear in a star-studded cast in musical fantasy film 'Into the Woods' and he particularly enjoyed acting alongside Meryl Streep in the movie because the Hollywood actress made him feel "at ease" during filming.
He said: "She's so aware of how you feel when she walks into the room, that she really does everything she can to put you at ease.
"It makes her just the best person to work with. There are so many people in her position that could really start to abuse that position on a film set and she just couldn't be further away from that.
"I loved every single minute of working with her on this. It was something I'll never ever forget and will cherish forever."
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Nick Jonas and Demi Lovato go bowling together.
The former Disney stars are close friends and love hanging out but the 'Chains' singer - who is dating Olivia Culpo - admits he usually wins when they take part in their favourite activity.
He said: "We usually go bowling. I've got my own ball and shoes and everything so I'd say probably I'm the best bowler. I'm very serious about that.
"We genuinely love just hanging out and playing music. It's great just to have no agenda but to vibe out."
Despite forging a solo career away from his brothers and Jonas Brothers bandmates Joe and Kevin, Nick has stayed close to his siblings.
He said: "We try and see each other as much as we can. Kevin is in New Jersey with his wife and baby so I try to get out there and visit.
"Joe and I see each other quite a bit in LA. We're very close."
But Nick admits he initially found it "hard" working alone.
He added to heat magazine: "There are moments where I've had to adjust to it just being me. I wouldn't necessarily say that I get lonely but it is a big adjustment.
"Also, in press and things like that, it's all on me now, instead of being able to spread it out."

Rob Marshall has praised James Corden's "unbelievable" talents.
The 'Into the Woods' director has expressed his delight at working with the 36-year-old star - who took on the role of The Baker - and his on-screen wife Emily Blunt, revealing he couldn't consider anybody else for the roles following their auditions.
He said: "James is extraordinary. I mean the range of this man is unbelievable. He has this incredible comedic sensibility and physical comedy which is so deep and so vulnerable and so amazing as The Baker and Emily walked in and said, 'This role is mine'. I've never seen anything like it."
And although the 31-year-old actress insists those weren't her exact words, Marshall claims he can't imagine having casted anyone else as The Baker's wife.
He continued: "She came in and sang ... And claimed the role and the warmth, the joy, the depth that she brings to the role ... The humour - it's extraordinary. I don't know anybody else who could do that."
The 54-year-old filmmaker also commented on the mix of British and American actors in the Disney musical and admitted that while it was unintentional, he enjoyed the Transatlantic atmosphere.
Marshall added: "It didn't start out like that at all. I honestly cast the greatest people for the roles - that was number on for me.
"We also had to do no work in terms of casting because people came in and claimed the roles. I asked Meryl (Streep) to do this and I asked Johnny Depp to do it but everyone else auditioned and everyone else came in and read through or sang through.
"It's really lined up in this beautiful way where we had this sort of multicultural cast and I loved it.
"I ended up with the most extraordinary cast and I have to say everybody sitting at this table is a dream for me to work with."

Snoop Dogg's next album will be called 'Bush'.
The 43-year-old rapper confirmed the title of his upcoming 13th solo album while at the Consumer Electronics Show in Las Vegas on Wednesday (07.01.15), also revealing fans can expect the LP to be released in mid-March.
The 'Drop It like It's Hot' hitmaker previously revealed Pharrell Williams is producing the entire album - which is being released on his i am OTHER label and Columbia Records - with the N.E.R.D. member praising the album by saying it is better than his own 2014 record, 'Girl'.
Speaking last year, the 'Happy' singer said: "Snoop's album is better than mine. You're gonna bug out from the approach and what we did."
The star's most recent release was 2013's '7 Days of Funk' which was created while he was using the alias Snoopzilla, in collaboration with Dam-Funk.
Snoop also hinted the material - which is believed to include contributions from Stevie Wonder and Charlie Wilson - won't sound like anything he has done previously.
He explained: "It's a great record me and Pharrell did from top to bottom. It feels good and I'm happy to be back in the studio working with one of my favourite producers and homeboys.
"It's different - it's completely different than anything we've ever done. It feels good, sounds good, looks good."

Jennifer Aniston thinks Justin Theroux was a gift from her dead ex.
The 'Horrible Bosses' actress - who is engaged to the 43-year-old actor - admitted that the man was "unappreciated" by her, before revealing that he "died years later of a brain tumour".
Speaking of the unnamed man, she shared to the New York Times newspaper: "He was my first love - five years we were together.
"He would have been the one. But I was 25, and I was stupid. He must have sent me Justin to make up for it all."
Meanwhile, the 45-year-old actress has revealed that the couple are having "big discussions" about marriage, with the 'Cake' actress admitting she would happily marry Justin if she could tie the knot "without all the buzzing and the noise".
When asked if the couple had already set a wedding date, she said: "There's a big discussion in our house right now: Do you just do it and say screw it? Or do you try desperately to get away with [a secret ceremony] where you don't have any fun because you're hiding in a cave somewhere?
"If we could do it without all the buzzing and the noise...It can be done. Where there's a will there's a way."

Harry Styles is in "talks" to star in a movie.
The One Direction singer has already met up with legendary film producer, Harvey Weinstein, to discuss appearing in a Hollywood blockbuster.
The 62-year-old film studio executive said: "There's no question he will enter the movie business. I get from him that he wants to. When you meet him, he's super-charismatic.
"He came to our Oscars party last year and then I went out to lunch with him. I've met him two or three times and he was very interested and charming. I think the guy is a movie star."
The 'Steal My Girl' hitmaker has already been offered a role by Harvey, who insists he's got the perfect part for the 20-year-old singer.
Harry, though, had to turn it down because of his world tour commitments with his bandmates: Liam Payne, Louis Tomlinson, Niall Horan and Zayn Malik.
Harvey shared to The Sun newspaper: "You know he's a dashing rogue - a fun-loving, spirited kind of actor that used to be in England all the time. Like David Niven or Douglas Fairbanks, he's got that vibe, he really does.
"And he doesn't even have to audition for me. We offered him a part and he couldn't do the movie because he had the tour. The amount of money their tour did is crazy, so he's got obligations."

Nicole Kidman's daughters won't be actresses.
Faith Margaret, 4, and Sunday Rose, 6 have no plans to follow in their mother's footsteps, according to the 'Paddington' star.
When asked if they would be joining the film industry when they're older, she said: "I think they would actually run the other way!
"[Acting] was just my desire and my motivation, and I don't see that in Sunday or Faith. They're like, 'Nope, we're not interested.'"
Nicole - who has the two young girls with her husband, Keith Urban - has revealed that Faith and Sunday have their own careers mapped out already.
She explained: "Sunday wants to be a vet right now and a party planner. Then she says she wants to be a stay-at-home mom and have eight children. I think that's her way of saying to me, 'Stay at home!'"
The 47-year-old actress - who also has Isabella, 22 and Connor, 19 from her previous marriage to Tom Cruise - has revealed that she nearly became the stay-at-home mother Sunday hinted at.
She shared: "At one point, I was going to stop working. It was when I was pregnant with Sunday, and I just went, 'I'm done.'
"I don't want to be in that place of pain where I'm missing things."
However, it was her own mother, Janelle, who convinced her to carry on acting as well.
She told People magazine: "My mum, who gave up her job and raised us, said, 'You should still do something creative. You should still keep a finger in the pot. I just feel that's your destiny. You shouldn't give that up completely.' I was like, 'You're right, Mum.'"

Khloé Kardashian is reportedly "stuffing her face" to get over her heartbreak.
The 'Keeping Up With Kardashians' star - who filed for divorce from her estranged husband Lamar Odom in December 2013 - is reportedly now chowing down on lots of junk food, following her split from boyfriend, French Montana.
A source said: "Smoked turkey legs, pasta, chicken wings, cookies-and-cream ice cream, and her go-to candy, Skittles. She can't stop eating!"
Kim Kardashian West - who recently told her sister to "lose a few pounds" on an episode of 'Kourtney and Khloé Take the Hamptons' - is reportedly making the 30-year-old television personality feel incredibly "self-conscious".
The source added to InTouch magazine: "Khloé's so self-conscious. She's an emotional eater and she's having a really hard time shedding the weight.
"There's always food at home. There are boxes of doughnuts and candy and she'll just stuff her face."
Meanwhile, Khloé recently joked that her weight gain was in sympathy for her pregnant sister, Kourtney - who has since given birth to a baby boy.
Posting a selfie on Instagram, Khloe wrote: "Monday with @gunnarfitness!!! I am determined to get my pre-hamptons, pre- sympathy kourtney pregnancy weight off.
"Nothing good comes easy. Why do I blame Kourt though?!? Lol. (sic)"

Sofia Vergara and Joe Manganiello are planning a "summer wedding".
The 42-year-old actress and model got engaged to the 'True Blood' star on December 25 and Joe is reportedly keen to tie the knot as soon as they can.
A source close to the actor revealed: "Joe is already talking about having a huge summer wedding.
"[They] want to have the wedding this summer because they want to have a baby together, but he wants to wait until she is his wife."
Joe, in particular, is said to be incredibly excited that two of his "dreams" are coming true.
The source continued: "This is all a first for Joe. He has never been married before and has never been a father, but these are two huge dreams of his that are finally coming true. He says that he owes all of this to his sobriety."
Sofia already has Manolo from her first marriage and the 22-year-old and her fiancé are getting on well.
The source shared: "Manolo already looks at Joe like a father-figure.
"Joe gets along great with him and is going to be an amazing dad."
The couple is also reportedly planning to buy a new house together "to support their growing family" and the 38-year-old actor hopes he can get stuck in with the wedding planning.
The source added to RadarOnline.com: "Joe is currently is working on a couple of projects, but says that he is going to take some time off in the near future to plan this wedding because he wants to be very involved in the process."

Justin Bieber hopes Mark Wahlberg is impressed by his Calvin Klein photo shoot.
The 'As Long As You Love Me' hitmaker - who is the new face of the underwear brand - would like the 43-year-old actor, who previously modelled for the same designer, to have a "positive reaction" to the recently released photographs.
The 20-year-old singer said: "Mark 'Marky Mark' Wahlberg shot his campaign in 1992 and we're still talking about it today, so I hope my ads make an impact the way his have. I hope his reaction is a positive one."
Justin is prepared for the comparisons between him and Mark and is hoping "people will see that I put my own spin on things".
Despite the pressure from the success of his predecessor, the 'Baby' hitmaker didn't suffer any nerves before the shoot:
He told Us Weekly magazine: "I wasn't nervous about doing the campaign
"It was the most fun I have ever had on a shoot."
Meanwhile, the pictures have reportedly struck a chord with the singer's on/off girlfriend, Selena Gomez, who reportedly told pals that he looks "smoking hot".
A source shared previously: "Despite still being angry at Justin and thinking he should be concentrating on his music career rather than modelling - she has admitted to pals she's still totally attracted to him and thinks he looks smoking hot in the new pictures."

Jessica Chastain dropped out of high school.
The 'Interstellar' star - who attended El Camino Fundamental High School in Sacramento, California - has revealed that she was a "terrible student".
She shared: "Nobody knows this about me - I dropped out of high school.
"I was not a hard worker. I was a terrible student."
The 37-year-old actress - who later attended The Juilliard School through a scholarship from Robin Williams - admitted that she was too absent at her high school to graduate.
She said: "Eventually I got my adult diploma, but I did not graduate.
"It wasn't that I just dropped out and never went back - at the end of the year I had too many absences to graduate... I would cut school and sit in my car, reading Shakespeare."
Jessica also revealed that her confidence in her own intelligence plummeted and has offered advice to children who may be feeling the same as she did.
She told Entertainment Weekly: "I thought that I wasn't an intelligent person because I did so poorly.
"There are kids out there that aren't doing well in school and I hope they never think it means they're stupid. It's all about finding where your interest lies and finding what you're good at."