Want to feel old? It's been over 15 years since Cruel Intentions came out. The re-interpretation of Les Liasons Dangereuses​ starred Sarah Michelle GellarRyan PhillippeReese WitherspoonSelma Blair, and oh yeah, Ryan Phillippe's butt. It's got a lot of now-iconic moments (that kiss, coke-in-the-necklace, the best use of "Bittersweet Symphony" ever), so it's really a surprise that it took this long for a tongue-in-cheek musical version.

Cruel Intentions: The Completely Unauthorized Musical parody opened last night in Los Angeles, and none other than SMG herself was in the front row, along with co-star Sean Patrick Thomas and writer/director Roger Kumble. Gellar even went backstage to meet the cast.

"It's so crazy. It was such a flood of memories. I don't necessarily think of it as me. But then they started talking, and I could feel the words coming out of my mouth!" she said. "We were babies when we made the film. I was 20! I celebrated my 21st birthday during filming." She also joked that it had to be "some form of child abuse" for them to be doing that stuff so young, and admitted to watching the movie when it's on TV, as long as she's not in the scene. Sure, SMG. Sure.