Karyn Bosnak Live Tweeting "What's Your Number?" Premiere for Us Weekly

Credit: Claire Folger

In the new rom-com What's Your Number? (in theaters Sept. 30), Anna Faris' character tracks down her former flames in hopes of finding the one that got away.

Inspired by author Karyn Bosnak's novel 20 Times a Lady, the star-studded cast features hotties Chris Evans, Zachary Quinto, Andy Samberg, Joel McHale, Dave Annable, Chris Pratt, Aziz Ansari and Mike Vogel.

Bosnak, 36, will be tweeting for Us Weekly live from the film's L.A. premiere beginning at 9:30 p.m. EST Monday. Be sure to follow @UsWeekly for Bosnak's funny red carpet anecdotes, exclusive pics and much more!