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The actress, who stars alongside Rumer Willis in the slasher, told reporters at the movie's UK press conference that she was surprised by the mix of horror and humour.
"We were pretty shocked when we saw the film, because the trailer came out like, 'This is a scary movie!'" she explained.
"Reading the script, there is stuff like the funny lines, but when we saw it, it was actually hilarious so every time you get scared you get to laugh, too."
Willis added that she was a "little jealous" of the stunts performed by Evigan in the movie, joking: "I'm [hiding] in the closet the whole time and there's not a whole lot of action going on!"
Sorority Row arrives in cinemas on September 9.
> Click here to watch our interview with Briana Evigan and Rumer Willis
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