Amid her on-and-off relationship with Diddy, Cassie had a brief romance with Kid Cudi. Here's everything to know about Cassie's relationship with Kid Cudi, including why he is now testifying at Diddy's sex-trafficking trial.

In week 2 of Sean 'Diddy' Combs' trial, prosecutors have called witnesses including the rapper Kid Cudi, a male escort known as 'The Punisher', singer Dawn Richard, Cassie Ventura's mum and Diddy's former personal assistants.

Casandra Ventura’s mother said she tried to pay the mogul to ensure her daughter’s safety, and an escort known as Punisher described engaging in up to a dozen “freak-offs.”

After his wife Casandra "Cassie" Ventura Fine's four days of testimony in the Sean "Diddy" Combs trial, Alex Fine wrote that "Cassie saved Cassie."

R&B singer Cassie is expected back on the witness stand Friday in her ex-boyfriend Sean “Diddy” Combs' sex trafficking trial, with prosecutors insisting cross-examination finish by the end of the day over concerns that the pregnant Cassie is near the birth of her third child.

This was intended to show that despite her earlier testimony to the severe abuse she says she endured in the relationship, Cassie loved Combs, that she occasionally initiated “freak offs,” that she changed her timeline of the rape allegation (albeit,

Editor's note: This page reflects the news from Sean "Diddy" Combs' trial on Friday, May 16. For the latest updates from Diddy's trial, read USA TODAY's live coverage for Monday, May 19.

A legal expert told Fox News Digital that Cassie Ventura's mother Regina may prove to be a crucial witness in the federal case against Sean "Diddy" Combs.