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.

Source: people.com

Lauren tries to uphold her friendship to Audrina, but is it already too late? Meanwhile Spencer tries to win Heidi back and risks her career to do so.

SEASON FINALE!!!