Days after Kelly tweeted Katie in retaliation to the former Apprentice star's comments about her mother's plastic surgery, Osbourne matriarch Sharon has taken matters into her own hands.
"My Darling Kel," wrote Sharon on her Facebook page. "Katie Hopkins is a person with zero credibility. She has no respect for others and contributes nothing to society. Her comments and opinions about us are of no importance."
"She is an embarrassment to all women and our country," she added. "I had to search on the internet to find out who she even is! Bless."
Sharon signed the open letter "Mumma" adding "P.S. Kelly you really are my mini me, I love you so much!"
The post quickly earned 23,600 likes from the X Factor judge's fans, as well as more than two thousand supportive comments.
Kelly and Katie's argument began earlier this week when Katie referenced Sharon's plastic surgery in her column for Best magazine.
"Sharon reckons her time on the [X Factor] panel may be up," said Katie. "Either way, if she is going to look this good next year she will need to bulk buy plastic."
Quick to jump to her mother's defence, Kelly lashed out on Twitter saying "you are a hypocritical vile human that is addicted to attention you are so insignificant! Don't you ever talk about my mother again! #India."
Mother-of-three Katie, who publicly clashed with Peaches Geldof on This Morning over the concept of attachment parenting, responded to Kelly's tweet, writing, "Just like Peaches and Jesus, Kelly has done well due to a famous parent."
The argument didn't stop there, with Kelly and Katie firing a string of insults back and forth.
"Just like you can't help the parents you came from neither can I! I don't see you on a @Forbes list, I work my bum off nice try...," said Kelly, writing in another tweet, "I feel sorry for you and your ignorance!"
"Actually made my night that @KTHopkins considers herself a lady when I think of her a desperate sad old bitter child is what comes to mind," added Kelly.
"No problem Kel. No one ever mistook you for a lady sweetie pie," responded Katie.