Read the latest news on the Sean "Diddy" Combs' trial in New York. Cassie Ventura, Combs' ex-girlfriend, took the stand as the government's star witness.

The singer, expected to be prosecutors’ star witness, took the stand in Sean “Diddy” Combs’ sex trafficking trial on Tuesday.

The singer broke down crying in court as she discussed Combs' "freak offs," a term for the mogul's alleged drug-fueled sex parties. She said that they made her feel "horrible" and "worthless" but that she continued to participate for "the one-on-one time" with Combs and out of fear that the rapper would become violent or find someone new.