Kevin & Danielle Jonas Celebrate Nick Jonas' Birthday in Vegas

Kevin Jonas stays close to his pregnant wife Danielle as they arrive at his brother Nick‘s 21st birthday party at XS nightclub on Sunday night (September 15) in Las Vegas.

The couple was of course joined by Nick, his girlfriend Olivia Culpo, as well as Joe Jonas and his girlfriend Blanda Eggenschwiler.

PHOTOS: Check out the latest pics of Kevin Jonas

A few days earlier, Kevin and Danielle hit the carpet for The Cut and New York Magazine’s Fashion Week Party with Revlon and Ciroc held at Gramercy Terrace at The Gramercy Park Hotel in New York City.

10+ pics inside…