Nick Jonas shares a kiss with new girlfriend Olivia Culpo during his 21st Birthday Dinner on Sunday night (September 15) in Las Vegas, Nev.
The twosome were joined by Nick‘s brothers Joe and Kevin, as well as their significant others Blanda Eggenschwiler and pregnant Danielle Jonas, respectively.
In the video, you can also watch the entire Jonas clan sing Happy Birthday to Nick before he cuts into his yummy cake. There are also some clips from the official party at XS Nightclub!