Spencer Pratt May Have Cheated on Heidi Montag

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In the trailer for the upcoming episodes of The Hills, it's obvious that the tension between Heidi Montag and Spencer Pratt has escalated.

"When we get back to L.A., I need you to move out... I gave up everything for you!" Montag says. "I'm not the one who wanted to see other people!"

Heidi and Spencer Reflect

Did Spencer Pratt - a notorious player before his emasculation in Season Three - really give his number to another girl, or even worse?

Stunningly, Heidi Montag and Spencer Pratt have chosen, exclusively, to open up about it in ... wait for it ... the latest issue of Us Weekly!

With Britney Spears under house arrest (or at least papa Jamie Spears' much-needed lockdown), Us Weekly had to go to Plan B - Speidi. We've yet to see Plan C.

Anyway, apparently there was some other girl who came in and wreaked havoc on the relationship of Heidi and Spencer, and her name's not Lauren Conrad.

"Spencer and I have really had our ups and downs this past year," Montag said. "I've definitely been betrayed by friends before, but I've never had a boyfriend do this to me. Spencer and I may differ on what it means to cheat."

They're on the same page as far as selling out and makin' bank, though!

"We're definitely on a roller coaster," said Spencer Pratt, who accompanied Heidi to her stepbrother's funeral this week. "I'm not too happy about a lot of things."

Montag and Pratt also revealed that Laguna Beach alumna and LC rival Kristin Cavallari was actually their matchmaker.

"[Kristin Cavallari] made it all happen," Pratt says. "She said to me, 'I know this girl who's so hot and perfect for you!'"

Hot and perfect for Spencer? Nah. But one out of two isn't bad.

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Kristin Cavallari Biography

Kristin Cavallari Looks Pretty
Kristin Cavallari is a Laguna Beach alumna, controversy magnet, former girlfriend of Brody Jenner and Nick Zano, and celebrity gossip... More »
Born
Birthplace
Denver, Colorado
Full Name
Kristin Elizabeth Cavallari