Looks like Rachel Bilson is going to have no problem moving out of The O.C. The 25-year-old has replaced Australian beauty Teresa Palmer to star opposite Star Wars hot stuff Hayden Christensen in the movie adaptation of the young adult novel Jumper, a source tells me. The sci-thriller is about a troubled young man who can teleport himself from one place to another. Palmer's rep did not mention the Bilson casting, but told me that her client is no longer with the project because director Doug Liman decided to make the character a wee bit older. "[Palmer] looks more 18, not 25," the rep said. Bilson's casting is fresh off her top-billing debut opposite Zach Braff in The Last Kiss. With Liman's production reportedly costing $100 million, this gig catapults the charming actress to potential blockbuster status. Nice jump, Rachel! Reps for Bilson and Liman did not return calls or emails by deadline.