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Kelly Osbourne called out her dad, Ozzy Osbourne's, alleged mistress in a series of brutal tweets on Monday night.

"Anyone looking for cheap chunky LOW-lights a blow out and a blow--- call [phone number redacted]," the rocker's 31-year-old daughter posted on Twitter, referencing the woman's job as a hairdresser.

It was a pretty nasty and extremely public attack ... and one that some of her fans took a lot of issue with.

"Hate your father not the woman," one of her followers tweeted back. "HE did this 2 ur family ... Again. #SMDH #childish."

That didn't sit well with Kelly, who shot back, "Are you in my family? NO YOU ARE NOT YOU HAVE NO IDEA WHAT SHE DID! So keep ur high-mighty opinions to yourself!"

Another follower sided with the previous fan, writing, "Why would it only be one persons fault??? It takes 2 to tango - both guilty. She knew he was married."

Kelly's response for that one: "My father is almost 70 ever heard of elder abuse?"

Sharon Osbourne addressed the split earlier this month on "The Talk."

"I honestly, honestly, cannot thank people enough for backing me, for saying they love me, for everybody here at my home supporting me, sending me messages of love," she said on the show. "I honestly, honestly am empowered and I have found this inner strength."

When asked if it was a rumor she kicked her husband out of their home, Sharon responded, "No, it's true. He's back and I'm out of the house."

"I honestly at this point today have no idea what I'm going to be doing with the rest of my life," she continued. "I love Ozzy dearly. He's given me an unbelievable life. He's given me three gorgeous children."