This is an excerpt from an interview Julia Stiles gave a few years ago:
Elle: And Within seven years—after putting in some TV time [Before women had wings; the 60’s] – your American sweetheart status was sealed with 10 Things I Hate About You. JS: Well, maybe its just paranoia, but I always think, instead of being perceived as the girl next door, I’m more perceived as, like, the feminazi, man hating lesbian. I mean, [guys] say, “You were such a bitch in 10 Things I Hate About You”—I thought I was just a strong, opinionated girl. [Laughs] Or I’ll meet guys and they’re, like, “Your favorite musician is Ani Difranco? You’re such a dyke!” She is so influential in my life on a female and political level, but I’m very staunch in my heterosexuality – not to quote Seinfeld, that there’s anything wrong with that.
Julia-Stiles.com
IIRC, Tara Reid has labeled herself as bisexual before, so I'll go with her.