Jamie Pressly denies being a body double.

"Poison Ivy 2" was a film starring Alyssa Milano. It was filmed during a period that Alyssa was taking her clothes off in every one of her movies to make people notice her again. Jamie Pressly denies a long standing rumor that her body was used for nude flashback scenes of Drew Barrymore in the guilty pleasure flick.
Star Pulse:
She tells Playboy magazine, "Drew plays Ivy in the first Poison Ivy film, and in Poison Ivy 2 Alyssa Milano plays the art student who moves into Ivy's old room in a house with other students. She finds a diary and pictures of Drew's character in a closet. The pictures are supposed to be of Drew, but they're of me, though you never see my face. When Alyssa reads Ivy's diary - Drew's diary - she imagines her, but instead of Ivy being Drew, she's me. People say I body-doubled her and it was my boobs and my ass in the movie instead of hers, but that isn't the case. I haven't had a body double myself, but I'm not opposed to it."