Cassie Ventura, the prosecution’s star witness in the sex-trafficking case against Sean “Diddy” Combs, told jurors Tuesday how her relationship with the music mogul went from lovestruck to abusive. Ventura said that in the early years,

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

This is day two in the trial of Sean Combs after the jury was seated. Opening arguments got underway Monday in the highly anticipated trial of hip-hop mogul Sean "Diddy" Combs, who has been accused of sex trafficking by force,

Sean "Diddy" Combs' sex trafficking trial began with the Cassie Tape being played, testimony from a male exotic dancer and opening statements.

Disgraced music mogul Sean "Diddy" Combs has pleaded not guilty to charges against him. Diddy's trial for sex and human trafficking, assault, and racketeering conspiracy will take place in New York, with no cameras allowed inside the courtroom.

Cassie Ventura testified that she did not remember how the term “freak off” came about but she recalled Sean Combs proposed “this sexual encounter, that he called voyeurism, where he would watch me in intercourse, sexual activity with another man” within the first year of their relationship.

Prosecutors allege the rapper used fame and violence to sexually abuse women, while the rapper's attorneys defended his "swinger" lifestyle.

Sean "Diddy" Combs' trial for sex trafficking and racketeering charges begins Monday, more than a year after he settled a lawsuit filed by his ex, Cassie Ventura, who accused him of rape and abuse.