It wouldn't be a party involving the cast of The Hills if it didn't include at least a little drama. Sunday night's Oscars after-party had plenty.

The lavish event - sponsored by Us Weekly, featuring Usonian Entertainment and the cast of MTV's The Hills - was held (fittingly) in the Hollywood Hills at the swanky home of Los Angeles real estate mogul Ronald Haft.

The most overheard question of the night: "Where's Lauren?"

As in Lauren Conrad.

As in Brody Jenner's former girlfriend (or current girlfriend, depending on what day you read this).

As in, Heidi Montag's BFF.

"I wish she was here," Montag said.

Aww. Good to see there's no bad blood between Lauren and Heidi, who have been cat-fighting of late.

But where was Lauren? The party buzz was that LC is none-too-pleased with comments allegedly made by Hills star Spencer Pratt in a recent Details magazine article - in which he encourages pal Brody Jenner to make Nicole Richie eat as a publicity stunt and date every celebrity possible in order to increase his own fame.

Understandably, Lauren would rather stay home watching rival Kristin Cavallari on Laguna Beach re-runs than attend a party and have to lay eyes on Pratt.

For what it's worth, when asked about Lauren on the red carpet, Jenner, who spent the night surrounded, of course, by the obligatory gaggle of hot blonde chicks, gentlemanly said, "I love Lauren. It's all good."

Of course, the party, which dragged on until nearly 3:00 in the morning, wasn't all backstabs and catfights. Everyone from Jenna Jameson to that due from Borat (Ken Davitan) was in attendance for some good clean fun.