Kristin Cavallari Livens Up 'The Hills'

... with her new boyfriend, Tal Cooperman.

Does the name ring a bell? If it does, it's probably because Audrina Patridge dated him last summer.

"It's brand new. They're having a lot of fun enjoying getting to know each other better," says a source of Cavallari's relationship with the co-owner of the DCMA Collective clothing line. "It's not for the show. They hit it off and have been hanging out off-camera."

The couple were spotted at Voyeur nightclub.

"They were making out on one of the club's VIP stages after midnight," says a clubgoer. "They were all over each other."

Kristin and Tal did, however, leave the club separately.

One of 'The Hills' main storylines has been tension between Kristin and Audrina over Kristin dating Audrina's ex, Justin Bobby. So now we know what Kristin's smiling about in these pictures :)

Photos by Wenn.com