Kate Upton Schools Lip Sync Battle With Her Sexy "Baby One More Time" Routine

Kate Upton is bringing the Britney Spears nostalgia to Lip Sync Battle. The Sports Illustrated stunner went up against Ricky Martin and re-created the iconic video for "Baby One More Time," complete with dance moves, pigtails, and sexy schoolgirl outfit. Even her fellow Swimsuit Issue cover girl Chrissy Teigen couldn't believe her eyes. Get a load of Kate's performance above now.