1. "I Kissed a Girl"
Released: April 28, 2008
Chart Peak: Number One (Seven weeks)
Perry has strewn contradictory autobiographical half-truths about which girl she did or didn't kiss on her first (and biggest) hit with a faux candor that's downright Dylanesque. Maybe a high school bestie really was her experimental game, maybe she was just fantasizing out loud about tasting ScarJo's cherry chapstick, maybe she made the whole thing up – songwriters do that sometimes, you know.