Superstar Salman Khan will be working on his birthday this year, as the actor has started filming the next schedule of his upcoming action-thriller "Race 3". The 51-year-old actor today commenced the shooting for a six-day-long schedule here. "Salman will be shooting for a six-day-long schedule for the film over the Christmas week. A pivotal action sequence is being shot in Mumbai, where Salman will be performing stylised action," the film's spokesperson said in a statement.