KEVIN FEDERLINE has turned to his ex-lover Shar Jackson for acting advice. The dancer/rapper, who ditched Jackson for Britney Spears, will make his movie debut in the thriller Night Watch, opposite Keanu Reeves and Oscar winner Forest Whitaker. Former Moesha star Jackson - the mother of two of Federline's children - has offered to give her ex tips on performing for the silver screen. She tells talk show host Larry King, "I will tell him, I can be his acting coach. That is what I do." Federline recently appeared in an episode of TV drama CSI: Crime Scene Investigation.