Nick Jonas Had a 'Jealous'-Themed Birthday Cake!

Nick Jonas shows off his super cool birthday cake while celebrating his special day on Friday evening (September 19) at Hakkasan Restaruant and Nightclub in Las Vegas.

The guys were in town the same night as the 2014 iHeartRadio Music Festival, where Nick hit the stage to introduce his friend Ariana Grande‘s performance.

Nick‘s birthday cake was themed around the music video for his new single “Jealous,” which features his girlfriend Olivia Culpo. She was in Vegas with him that night to help celebrate!

Patrick Schwarzenegger celebrated his 21st birthday that night separately at the same place and he partied with pals while DJ Tiesto spun tunes at the club.

15+ pictures inside of the guys celebrating their birthdays in Vegas…