Known as “Victim 1” in the indictment and “Cassie” in the music world, Ventura – who is pregnant and in her third trimester – took the stand Tuesday in what is likely to be several days of intense testimony. She was on the stand for about 4.5 hours Tuesday and is set to return Wednesday for further questioning.

Prosecutors' star witness, Sean "Diddy" Combs' ex-girlfriend Casandra Ventura, took the stand on Tuesday in the hip-hop mogul's sex trafficking trial, accusing the rapper of controlling her life and coercing her into "humiliating" sex acts.

The 55-year-old hip-hop mogul has been charged by federal prosecutors with sex trafficking, racketeering conspiracy and transportation to engage in prostitution.