For anyone who has seen a trailer or TV spot for [movie id="433352"]"The Roommate"[/movie] -- the upcoming thriller starring Leighton Meester, Minka Kelly and Cam Gigandet -- it's clear that the film contains the following: beautiful people in college, beautiful people in college going crazy and beautiful people possibly getting in possessive girl fights.

Naturally, we don't want to spoil anything, but one of the key elements to a good thriller is a good balance of tension and action. "The Roommate" happens to have a few of those scenes, particularly a climactic battle royale. When MTV News caught up with Kelly and Gigandet recently, we asked them to explain the elements to a good girl fight, and specifically what went into the one in their film.

"The key elements to a girl fight ... having a guy get knocked out by a girl is always a key element," Gigandet joked, hinting at something his character endures in the film. "Yeah, that one took a blow to my ego as well."

Gigandet said Kelly and Meester's performances dispel "the image of a women's fragileness. Their fight put that to rest. These girls are not fragile; they're badasses. So that was my favorite part of it."

Kelly, who plays the innocent nice girl to Meester's crazy chick, said there was a lot of work involved in making the scene believable.

"We worked really hard to make sure it looked like a real girl fight," she explained. "I Googled 'girl fights' on YouTube, and we made sure it was messy and hair was everywhere."

Kelly added that they threw real punches and knees, and that they did their own stunts. "We fought to kill, because unfortunately, when girls fight, they fight to kill, and that was very true and real in our fight. We did our own stunts. We were pretty banged up by the end of it," she admitted.

"I wanted to make sure that our fight looked like a real girl fight," Kelly continued. "I didn't want it to look too choreographed or rehearsed. I wanted it to be messy and intense. That's why we made sure it was us; every frame it's us."

Check out everything we've got on "The Roommate."

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