Kelly Osbourne just tweeted the phone number of her dad's mistress.

Uh-oh, it looks like the Osbourne family saga is getting really ugly, really fast.

For those who aren’t quite up to date, this is what’s gone down so far:

News broke two weeks ago that former rockstar Ozzy Osbourne had been kicked out of his marital home after being caught cheating on his wife of 33 years, Sharon.

According to various sources including E News and The Sun, the Black Sabbath singer and his wife “mutually agreed” to split after Ozzy, 67, engaged in an affair with well-known celebrity hairstylist Michelle Pugh, 45.

And now? The drama has kicked up a notch — with the couple’s youngest daughter Kelly weighing in on her dad’s indiscretions with an extremely fiery tweet.

"Anyone looking for cheap chunky LOW-lights a blow out and a blowjob," the 31-year-old TV personality tweeted to her four million followers, adding Pugh's personal phone number.

Of her tweet, Kelly promptly spoke to Page Six to explain she wants to send a very clear message to her father's mistress: “Don’t f**k with my family, don’t f**k with my momma, and don’t f**k with me.”

Pugh and Ozzy are yet to comment on the tweet.

Meanwhile, we're all sure this won't be the last we hear about this celeb scandal.

Do you think Kelly was in the wrong for tweeting a private number?

Watch Mamamia staff reveal the moment they knew their relationships were over.