Sharon Osbourne was amused by daughter Kelly's naughty tweet, in which she revealed the personal details of her father's mistress.
Angry Kelly offered up hairdresser Michelle Pugh's private phone number to her followers on Monday (23May16) as payback for the fact she came between her parents.
Kelly wrote: "Anyone looking for cheap chunky LOW-lights a blow out and a bl**job call..." adding a Los Angeles-area phone number.
And now her mum has come to her daughter's defence amid mounting criticism she went too far, admitting she though the catty tweet was a hoot.
On Tuesday's edition of U.S. talk show The Talk, Sharon's co-host Julie Chen read aloud Kelly's social media message, prompting a chuckling Osbourne to say, "In cases like this, what can you do but laugh?"
"She's (Kelly) so funny. She loves her mom. She loves her dad so much... I'm always proud of my girl. What are you going to be mad (about)? She's an adult."
But not all Kelly's followers shared her mum's thoughts and some attacked her for invading another woman's privacy.
One of her four million Twitter followers wrote: "Hate your father, not the woman. HE did this to your family..."
Furious Kelly wrote back, "Are you in my family? NO YOU ARE NOT. YOU HAVE NO IDEA WHAT SHE DID! So keep your high-mighty opinions to yourself!"
Another critic added: "Why would it only be one person's fault??? It takes two to tango, both guilty. She knew he was married", prompting Kelly to respond: "My father is almost 70. Ever heard of elder abuse?"
Meanwhile, there's still hope that Sharon and Ozzy's marriage can withstand the crisis - Sharon was wearing her wedding ring again during her appearance on The Talk on Tuesday.
She initially kicked Ozzy out of their family home in Los Angeles after news of his affair broke. She then left when the rocker moved back in.