"Realizing that Robert Pattinson has lots of female fans, 19-year-old Kristen Stewart allegedly gets jealous with Emilie de Ravin, his co-star on upcoming drama movie "Remember Me". A source tells Star Magazine in its June 22 issue that Stewart really feels afraid of losing the 23-year-old hunk as he has flown to New York City with de Ravin to film the flick. "Kristen's been calling him nonstop since he's been in New York and gets uneasy when he doesn't answer," the source confesses. "She's nervous he'll fall for Emilie. She thinks it's only a matter of time before he hooks up with another girl." Moreover, the source says there is a possibility that de Ravin falls in love with Pattinson because she recently split from her husband of 3 years Josh Janowicz. "Rob could be Emile's rebound guy", the source continues telling Star Magazine. "He's her type, boyish, with chiseled features."