Following a weekend in Las Vegas for Joe Jonas’ 25th birthday, it appears as though “Chains” singer Nick Jonas and Olivia Culpo are still a couple.

Jonas has recently strayed away from his pop image, releasing a solo single without the help of his brothers or the Administration. However, it appears as though the singer’s music isn’t the only thing he has been busy with.

Despite rumors of the famous couple going in separate directions, Jonas was spotted cozying up with his 2012 Miss Universe girlfriend in Vegas.

"Nick and Olivia walked into the pool hand-in-hand, and from the way they acted, it seemed like they were as comfortable as ever," a source told People. "They weren't overly showy, but they definitely seemed happy."

Jonas and Culpo’s relationship was confirmed in 2013, where they were seen kissing at the US Open. This weekend was no different, with Jonas openly introducing Culpo as his girlfriend to his brother’s famous friends, including Adrian Grenier (Pretty Little Liars), Ashley Benson (Pretty Little Liars), and Alex Pettyfer (Magic Mike).

The singer most recently released his single, “Chains,” and is currently working on an untitled album, which is rumored to feature Demi Lovato.

Image courtesy of Jennifer Graylock/INFphoto.com