Spencer & Heidi Hit Vegas, Stay in Separate Hotels

When The Hills returned Monday, Spencer Pratt traveled to Colorado to try and mend his relationship with Heidi Montag — only to be told she needed “space.” Well, judging from their visit to Las Vegas on Wednesday, space is exactly what she got.

Sources at various casinos tell PEOPLE that not only did the couple stay in different rooms, they’re actually in different hotels. Montag is staying at the Palazzo and Pratt has checked into the Hard Rock.

“Yes it is true,” a rep tells PEOPLE. ‘”They are working on their relationship … They were there filming The Hills.”

While in Vegas working on the show, the on-again, off-again couple was spotted arguing for the cameras at the Palazzo’s Dos Caminos restaurant. When the camera’s stopped rolling on multiple occasions, Pratt left the restaurant while Montag stayed behind, hanging out with Los Angeles club promoter and her Hills boss Brent Bolthouse.

Interaction on and off-camera was limited between the two. During his downtime, Pratt kept clear of Montag, taking in a mixed martial arts fight at Hard Rock and later having dinner with his sister Stephanie at Wolfgang Puck’s CUT Steakhouse.

Meanwhile, Audrina Patridge will be in Las Vegas Friday to host the Pussycat Dolls show at Pure Nightclub. –Mark Gray

Re: Spencer & Heidi Hit Vegas, Stay in Separate Hotels

She is so stupid. So is he. I can't believe I opened this.