Kate Hudson and Nick Jonas may not have admitted that they are dating, but sources told Entertainment Tonight they've been getting a little sneaky.

Hudson, 36, and Jonas 23, were spotted at the launch party for Demi Lovato's new single "Confident" at the Industry Club in NYC on Thursday.

"So proud of my friend @ddlovato on the release of her new album CONFIDENT!" the Jealous singer tweeted. "This record is a masterpiece. Go check it out."

Jonas was at the venue first to introduce his pal on stage, while Hudson arrived in a sexy black cut-out jumpsuit later that night with some of her friends.

Although they didn't show up together, it was pretty clear why the Almost Famous actress was at the party. After the event, an eyewitness told ET that the singer was seen sneaking into the hotel where the actress was staying.

Hollywood Life reports that Jonas isn't too far from making things serious. "Nick is head over heels right now with Kate Hudson. He loves the relationship, he wants to act with her, he is completely enamored by her and has never felt this way about a girl before," an insider revealed. "She pushes all the right buttons for him and he is all in! It's major lust right now but love is right around the corner."

The pair was first spotted together last month having a great time at Disneyworld.

Not too fast for the couple, though, as both of them are still on the rebound. Hudson called off her engagement with rock star Matther Bellamy in December, while Jonas just broke up with longtime girlfriend and former beauty queen Olivia Culpo.

Amid dating rumors, Jonas set the record straight earlier this month. "I'm 23, single and loving life," he told ET Canada."And in a moment, I'm just trying to have as much fun as possible.