Ozzy Osbourne's ex-mistress suing Kelly Osbourne for defamation

Kelly Osbourne arrives at Zoe Kravitz Celebrates Her New Role With Yves Saint Laurent Beauty on May 18, 2016 in Los Angeles.

Frazer Harrison/Getty Images

While Ozzy Osbourne and his wife, Sharon, seem to be moving past his infidelity, another battle is sparking as Ozzy's mistress is suing his daughter, Kelly, for defamation.

Michelle Pugh filed a suit Wednesday claiming she was "slut-shamed, bullied and harassed for allegedly breaking up a marriage" and "wrongfully accused of a crime," according to the NY Daily News.

In May, Kelly went on a Twitter tirade about the affair, posting Pugh's phone number. She quickly deleted it, but Pugh's suit argues the tweet caused "a rash of mass cyber-bullying."

Earlier this week, Pugh called Ozzy "the greatest love of my life."