Nick Jonas and Patrick Schwarzenegger celebrated their birthday at the same venue on Friday (19.09.14).
The 22-year-old singer and the 21-year-old model marked their annual milestones separately at the celebrity hot spot Hakkasan in Nevada, Las Vegas.
Nick, who was dressed in a navy striped blazer and white T-shirt, was joined by his girlfriend Olivia Culpo as he partied the night away with his close friends.
Taking to his Instagram account after the celebration, he posted a picture of his huge birthday cake, which was made to look like it was made out of televisions, and thanked the venue for hosting his party.
He wrote: "Birthday in #Vegas thanks #Hakkasan for the Bday love @oliviaculpo (sic)."
Meanwhile, Patrick, the son of Arnold Schwarzenegger, celebrated his birthday with a smaller cake, but still looked impressed with the calorific treat, which had been made out of blue icing with a big "21" stuck on the top, as he grinned for the camera.
The hunk even had a go at spinning some tunes on the decks in the DJ booth as he attempted to keep his celebrations low-key with a number of his pals.
However, the actor admitted the next day that he was suffering as a result of the previous wild antics.
Taking to his Twitter account on Saturday, he tweeted: "Woahhhh. Feeling it today. (sic)."

Denzel Washington isn't campaigning to play James Bond.
The 'Training Day' star has quashed rumours he is keen to take over the secret agent role from current 007 Daniel Craig and insists his joke about starting a campaign for the part was taken the wrong way.
He told Shortlist magazine: "I was on the phone, and the person on the phone was asking me the questions that were being sent in to her, and so then she was sending out my response to whoever's online. So the was question was, 'Would You play James Bond?' and I said, 'Yeah sure, why not?' and jokingly, 'Yeah, get out there and start a campaign! Denzel for James Bond!'
"But in the translation from the way I said it, to the way she put it down, to the way it went out to the world, you didn't get my sarcasm. You didn't get the irony of it.
"So no, I'm not campaigning to play James Bond. I just answered the question and jokingly said, 'Hey let's get a campaign!' "
The 59-year-old actor was shocked by the results of the misinterpreted Q&A which quickly garnered support on Twitter with the hash tag '#DenzelsJamesBond'.
He added: "I haven't thought about James Bond I was just asked about it. But it's interesting what happens to information. Things like this James Bond thing can just easily happen.
"It's not a bad thing but people think it's fact, you know what I mean? When it's not fact. What happened to the horse's mouth."

Donny Osmond will join 'Strictly Come Dancing' as a guest judge.
The pop icon is set to be part of the panel for the show's third live episode, and he claimed he celebrities will have to show "chemistry" and dedication to earn top marks.
He said: "I'll be looking for partner chemistry and for the performer who is ready to put it all on the line."
Donny - who won US contest 'Dancing with the Stars' in 2009 - was reportedly seen as an "obvious choice" when show bosses became keen on using a guest judge on the current series of the celebrity ballroom competition.
An insider told The Sun on Sunday newspaper: "The bosses were keen to have a guest judge for one of the live shows and Donny seemed an obvious choice."
The 'Puppy Love' hitmaker will be sat alongside Len Goodman, Darcey Bussell, Bruno Tonioli and Craig Revel Horwood, and the latter recently took aim at rival TV show 'The X Factor' after Cheryl Ferandez-Versini suggested winning the singing contest meant more than 'Strictly'.
He said: "I think it is sour grapes. As long as she keeps crying, that's all the audience wants from Cheryl.
"I think Simon [Cowell] made her say it - they're getting desperate for viewers so I think they'll use anything they can.
"[As for Cheryl's judging], I think if you get that attached to people it does harm your judging skills."

Ola Jordan would quit 'Strictly Come Dancing' to start a family.
The star - whose husband James was dropped by show bosses - has admitted she doesn't know if her future lies with the celebrity ballroom contest, and suggested children could be in her future.
She told the Daily Star Sunday newspaper: "I don't know about doing the show next year, I really don't know.
"I really want a family. And whatever life brings me, I'm going to do it, so I don't mind what happens with 'Strictly'.
"I think you have to take opportunities as they come and I might have a family to think about by next year. I really don't know if I'll want to come back."
Ola appeared on the BBC show for eight years, along with her husband, before he was axed and she has admitted it's difficult working without him around.
She added: "Everyone's been lovely. They've all been really supportive but it's still very strange for me to be there without James.
"I'm getting on with my job but I'm missing him very much. It's hard being away from him. I'm going to try to enjoy it without him."

Chris Martin has "fallen in love" with Jennifer Lawrence.
The Coldplay frontman, who split from Gwyneth Paltrow in March after 10 years of marriage, has reportedly told friends his romance with 'The Hunger Games' actress is "the real deal."
A source close to the couple, who started dating in June after the 24-year-old beauty attended one of his concerts in London, told Us Weekly magazine: "He's fallen in love. It's the real deal."
Jennifer has reportedly had a crush on the British rocker, 37, since she was a teenager.
Another insider said: "It's a fantasy come true."
The duo were recently spotted enjoying a romantic date at the Chateau Marmont hotel in West Hollywood last Thursday (11.09.14).
An eyewitness said: "They made out at the table."
A source previously revealed that Chris - who has children Apple, 10, and Moses, eight, with Gwyneth - pulled out all of the stops to romance Jennifer and has been writing love songs for her.
The insider said: "He writes her songs and loves taking her to private romantic spots. Chris is sweeping Jen off her feet. That's his thing."

Tom Hardy has married Charlotte Riley in a secret ceremony.
The 'This Means War' actor tied the knot with his partner in front of "their closest friends and family" at 18th century castle Chateau de Roussan in Province in July.
An insider told The Sun on Sunday newspaper: "It was a beautiful, low-key day made even more special because they just had their closest friends and family around them.
"Tom's son Louis [from his relationship with Rachael Speed] played a key role in the ceremony.
"And they made certain to pic a stunning and private setting. The castle is in the centre of Provence and overlooks the Alps."
The secret nuptials took place on July 4, and the couple are said to have shunned a "flash" and wedding in favour of something much more intimate.
The source added: "Both sides of the family then stayed on as guests afterwards in the hotel.
"There was nothing flash about the wedding, they always said they wanted it to be about the two of them and their family rather than any grand gesture."

Zayn Malik was shocked when a fan fainted at his touch.
The One Direction heart throb has admitted he wasn't prepared for the fanaticism the band would be faced with early in their careers - after finished third on 'The X Factor' in 2010 - and he was stunned when one avid supporter "literally dropped to the floor" after meeting her hero.
Writing in 'Who We Are: Our Autobiography', he said: "I did a signing at a shopping mall during this early promotional date and a girl gave me a CD to sign.
"I took it off her and as I did, my hand must've touched hers - instantly she stone-cold fainted, flat-out, right on the spot! She literally dropped to the floor, lights out.
"I'd never sen anything like that in my life ... Never in a million years would I expect someone to react in such an extreme way to meeting them ... I couldn't process it back then - and I still can't now."
Meanwhile, his bandmate Harry Styles has admitted he used to struggle with nerves early in the 'Story of My Life' hitmaker's career, but he has learnt to use them to his advantage.
He said: "I suffered some pretty serious confidence issues when i first appeared on stage ... Sometimes just standing on a stage made me nervous ... Now it's a totally different game.
"Now I now that if your nerves are controlled correctly, it can actually give you a bit of an edge, an extra sense of focus. If you let the take over completely they can really put you off."

Simon Cowell and Cara Delevingne have held secret talks about her music career.
The media mogul is said to see the model - who previously gave up a deal with the 'X Factor' boss' rival Simon Fuller - as a potentially huge star and while a contract hasn't been offered, the two parties have been having private meetings.
A source told the Sunday Mirror newspaper: "Simon reckons Cara has the chance to make them both money.
"His people haven't offered her a record deal but have been interested in talking to her."
According to the reports, Cara is keen to develop her career naturally rather than use Syco Records as a fast-track to the top - which would see her get a lot of exposure on the likes of 'The X Factor' UK and 'Britain's Got Talent'.
Meanwhile, it is said while the pair have met, they were "informal" and no deal is on the table as of yet.
An insider added: "There were a couple of informal meetings earlier in the year."
It was recently claimed the Burberry model launched her music career in a "dive pub" in New York.
During the solo gig, Cara reportedly sang several original tracks along with a set of covers, which she performed acoustically at the small venue.

Channing Tatum says wrestling is one of the "most painful" things he's ever done.
The 34-year-old actor stars as Olympic medal-winning wrestler Mark Schultz in the film 'Foxcatcher' - which is based on real life events - and while he enjoyed learning the sport, he has no plans to carry on doing it.
He said: "Wrestling is one of the most painful things I've ever done. I've played many sports but none like this. It's the only sport I know where you have no down time, no time to pull away and rest.
"Even in boxing, you can back away and dance around a bit, but in wrestling you're locked in combat with the other guy the whole time, and that's it.
"It was an amazing discipline to learn, but I do not need to do it ever again."
The '21 Jump Street' star - who turned down the role in 'Foxcatcher' when he was first offered it because he felt he hadn't grown up enough to understand the psychological thriller - also admitted his love of sport has led to him becoming a very competitive person.
Quizzed on how competitive he is, he told Britain's HELLO! magazine: "Very, very competitive. I wish I could say I've evolved into the sort of person who's a good loser, but I'm not.
"I'm the kid who is not happy at all if our team loses, and I'll go to pretty much any length to win. I get that from my dad."

Perez Hilton thinks Kim Kardashian West is "out of control."
The acid-tongued gossip blogger slammed the reality TV star and insisted he doesn't expect her marriage to Kanye West - with who she has 14-month-old daughter North - will last, though he does expect them to have another child.
He told Closer magazine: "Her fame is out of control now she's with Kanye. Kim's desperate for another baby and they'll probably last until she gets that.
"She's smart enough to know that you need to have at least two children to get as much money as possible!
"As we know, Hollywood couples never last the course - there are too many egos involved!"
The father-of-one explained his pessimism about the longevity of Kim's fame, suggesting that people are losing interest in the 33-year-old beauty and shifting their attention to her younger half-sisters, Kendall and Kylie Jenner
He added: "Kendall and Kylie are the future. People are interested in their edgy style and crazy antics.
"Kim, Kourtney and Khloe are simmering with jealousy! The whole thing's bound to end in a massive bitch fight!"

Big Sean is reportedly jealous of Harry Styles.
The 26-year-old rapper wants the One Direction star to stay away from his girlfriend, Ariana Grande, and hates that they have stayed in touch since working on the song 'Just A Little Bit of Your Heart' together.
A source told America's OK! magazine: "Big Sean doesn't like it that Harry's been wooing her. He wants Harry to back off and leave Ariana alone."
The British singer, 20, penned the track especially for the 21-year-old beauty earlier this year.
Big Sean recently insisted he and Ariana have "great chemistry."
He said: "Me and her make a lot of music together and the chemistry between me and her when we work is great.
"We got more in the works too. I feel like her voice is crazy, [just] that that big voice comes out of her is insane. I was probably one of the first people to tweet about her music; me and her been friends for years before anything else...
"I was the first rapper to perform at the White House, I performed there with Ariana so that was an honour."
The couple's romance, which began two months ago, came as a shock to fans as Big Sean - whose real name is Sean Anderson - only ended his five-month engagement to 'Glee' actress Naya Rivera in April this year.

Will Ferrell loves date nights with his wife.
The 'Anchorman 2: The Legend Continues' star, who has been married to Swedish art auctioneer Viveca Paulin for 14 years, loves planning romantic evenings with her away from their three children, Magnus, 10, Mattias, seven, and Axel, four.
The 47-year-old actor told Us Weekly magazine: "We're able to steal away for a moment here and there."
He jokingly added: "We're not afraid to leave our kids home without a sitter, and tell them how to work the cellphone."
Will - who met Viveca in 1994 when they attended an acting class together - also insists that his sons get along very well.
He said: "You know, the usual ratio of fighting and cooperation."
Will previously admitted he loves being a father and said his sons make him laugh all the time.
He said: "Boy, they make me laugh probably every single day just with the way they look at the world. As everyone who has kids knows, [children have] a completely unique outlook about the world, and the stuff they come up with every day makes me laugh."