Heidi Montag and Spencer Pratt's Vegas Party

Heidi Montag and Spencer Pratt's Vegas Party

Heidi Montag and Spencer Pratt were out last night getting their party on at Jet nightclub in Las Vegas.

The couple, who star in MTV's hit show The Hills, were spotted drinking it up and partaking in a little dirty dancing - with little sign of irritation caused by a recent blowup at a Hollywood club with Lauren Conrad.

According to Us Weekly reports, the ongoing feud between Heidi and Lauren takes a turn for the worse on this coming Monday's episode. In a sneak peek of what's in store, Conrad confronts her former roomie about spreading sex tape rumors when the two run into each other at Les Deux.

"You think it's OK for someone to say those things about people, and go on and think it's funny?" Conrad asks, as co-star pals Audrina Patridge and Whitney Port watch on.

"I had nothing to do with you and anything that you've done with your ex-boyfriend!" Montag yells back, although she didn't deny starting the rumors.

Lauren responds, "You can keep saying that and make yourself think you're a good person, but you're a bad person!"

For the rest, you'll have to tune in to The Hills on Monday!