Rapper Kid Cudi will take the stand Thursday in the closed door federal sex-trafficking trial against Sean "Diddy" Combs in a big day for prosecutors.

Sean ' Diddy ' Combs trial is underway in New York for the second week after testimony from his ex-girlfriend and main accuser Cassie Ventura concluded.

Sean ' Diddy ' Combs' trial for sex-trafficking and racketeering is on its sixth day in New York City .