Kellan Lutz was in good spirits as he went through the security line at LAX yesterday. He's heading to Vancouver to rejoin his Breaking Dawn castmates who made the trip north, including Peter Facinelli, who touched down in Canada on Monday. Kellan's coming off a fun break from work, during which he rang in his 26th year with his brother Brandon. The siblings partied in Las Vegas over the weekend, though Kellan was traveling on his actual March 15 birthday. He wasn't the only star celebrating in Sin City, since Paris Hilton, the cast of Jersey Shore, and Emmanuelle Chriqui were also spotted soaking in the desert scene.