Kristen Stewart, Robert Pattinson (THEN)(01 of16)
Open Image ModalAre they or aren't they? The photogenic co-stars' chemistry onscreen was palpable, but Kristen Stewart and Robert Pattinson played coy about a real-life romance... (credit:Getty)
Kristen Stewart, Robert Pattinson (NOW)(02 of16)
Open Image ModalNikki Reed (THEN)(03 of16)
Open Image ModalThe actress was previously best-known for her role as the bad girl in "Thirteen." Now she's... (credit:Getty)
Nikki Reed (NOW)(04 of16)
Open Image ModalMarried to "American Idol" alum Paul McDonald, with whom she is making sweet music together. The pair is working on a six-song EP together. (credit:Getty)
Kellan Lutz (THEN)(05 of16)
Open Image ModalBy 2008, the budding beefcake had mostly scored roles in television shows like "The Comeback." (credit:Getty)
Kellen Lutz (Now)(06 of16)
Open Image ModalNow he's slated to star in action films like the upcoming "Tarzan" and "Immortals." (credit:Getty)
Ashley Greene (THEN)(07 of16)
Open Image ModalAshely Greene was hardly a house-hold name after bit TV roles in "Desire" and "Shark." (credit:Getty)
Ashley Greene (NOW)(08 of16)
Open Image ModalNow 25, the stunning actress is gracing covers of magazines like "Seventeen." (credit:Getty)
Taylor Lautner (THEN)(09 of16)
Open Image ModalYoung love: Taylor Lautner was linked to chanteuse Taylor Swift early on in the "Twilight" franchise. (credit:Getty)
Taylor Lautner (NOW)(10 of16)
Open Image ModalNow 20, he's become one of Hollywood's most promising young stars. He's already set to co-star with Adam Sandler in "Grown-Ups 2." Meanwhile, Swift has long since moved on (though the two appear to have remained good friends). (credit:Getty)
Dakota Fanning (THEN)(11 of16)
Open Image ModalDakota Fanning was already a veteran when she went from a child prodigy actress to bloody vamp for "New Moon." (credit:Getty)
Dakota Fanning (NOW)(12 of16)
Open Image ModalNow she's still a veteran actress who happens to be besties with Kristen Stewart, whom she's acted with in the "Twilight" films and 2010's "The Runaways." (credit:Getty)
Peter Facinelli (THEN)(13 of16)
Open Image ModalThe actor had been married to Jennie Garth for seven years when he got his first major acting break. (credit:Getty)
Peter F (NOW)(14 of16)
Open Image ModalNow he's not. He filed for divorce from Garth in 2012. (credit:Getty)
Michael Sheen (THEN)(15 of16)
Open Image ModalMichael Sheen brought his adorable daughter Lily with him to the the 2009 premiere of "New Moon." (credit:Getty)
Michael Sheen (NOW)(16 of16)
Open Image ModalSadly, Lily will likely have to move over (or at least, make room) for the new red carpet lady in Sheen's life: Rachel McAdams. They couple started dating in 2010, after meeting on the set of the Woody Allen film "Midnight in Paris." (credit:Pacific Coast News)