Jaden Smith and Jackie Chan star in The Karate Kid in 2010

Will Smith helped martial arts legend Jackie Chan celebrate his 70th birthday by sharing some throwback snaps from The Karate Kid remake. Smith, 55, served as a producer on the 2010 remake, which starred Chan alongside the producer's son Jaden, now 25, who was just 12 when the film was released. The actor/rapper/producer/ shared a slew of behind-the-scenes snaps with himself, his son and Chan from the set.