Nick Jonas and Patrick Schwarzenegger celebrated their birthday at the same venue on Friday (19.09.14).
Jonas 22 and 21-year-old model Schwarzenegger marked their annual milestones separately at the celebrity hot spot Hakkasan in Nevada, Las Vegas.
21-year-old modeNick, 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)."