Prepare to have your mind blown: Cruel Intentions was released 18 years ago this week. (Feeling old? Same.) Yup, the film that cemented Sarah Michelle Gellar (Kathryn), Reese Witherspoon (Annette), and Selma Blair (Cecile) as teen royalty is celebrating its birthday – so naturally, we're celebrating its 'fits. From Kathryn's penchant for a slip to Cecile's preppy steez, here's how you can channel the sassiest girls in movie history now.