Dakota Fanning  carried her jacket yesterday when she arrived at LAX. The actress headed toward her gate to catch a flight out of town, perhaps taking off to join her Breaking Dawn  costars on set in Canada — wherever she was going, a celebration was in store as today is her 17th birthday! Some of her onscreen partners, like Robert Pattinson  and Kristen Stewart , headed to Vancouver just a few days ago . The young actress who plays Robert and Kristen's daughter in the film, Mackenzie Foy, was also spotted making the trek . Dakota has been busy working on the film and taking some time away from her senior year of high school, including a stint before the camera last month .