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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."

Britney Spears' ex-husband Kevin Federline is embarking on a movie career after landing a part in Keanu Reeves' new film.

The dancer/rapper will play a "small but notable" role in the thriller Night Watch, opposite Reeves and Oscar winner Forest Whitaker, according to In Touch Weekly magazine.

It won't be the 29-year-old's first acting job - he appeared in an episode of TV drama CSI: Crime Scene Investigation, which aired in America last year