When someone attacks one of them, the Osbourne family tends to circle the wagons. And by circle the wagons we mean tear whoever it is a new one.

The budding feud
 between Kelly and Sharon and Lady Gaga is just the latest example of the Osbourne ladies' scorched earth policy.

After Kelly said Lady Gaga's fans threatened her over comments she made about Mother Monster on her E! "Fashion Police" show, Gaga posted an open letter to Kelly on Thursday about bullying, which drew an immediate, scathing response
 from mother Sharon.

It was just the latest chapter in a storied history of dirty laundry airing and public call-outs from the mother/daughter duo.

Sharon Vs. NBC Back in August 2012, Sharon quit as an "America's Got Talent" judge after claiming that another NBC show, "Stars Earn Stripes," had booted son Jack after he disclosed that he'd been diagnosed with multiple sclerosis. The network denied her claims, but not before Sharon told the New York Post, "I just can't be fake ... it's discrimination, and it was badly handled."

Kelly Vs. Christina Kelly, who has spoken about her issues finding a healthy weight in the past, has an ongoing feud with Aguilera over body issues. "She called me fat for so many f---ing years ... So you know what? You're fat too," Kelly said in August 2011 about Xtina on "Fashion Police." The back-and-forth began in 2003 at the MTV Europe Music Awards
 when Aguilera was spotted throwing darts at a picture of Osbourne, prompting co-host Kelly to call the singer a "sad, sorry person."

Kelly Vs. Luke Worrall When Kelly broke up with fiancé Worrall in July 2010, she didn't go quietly. Nope, she claimed the model not only cheated on her, but at one point did so with a pre-op transsexual who used to be a man. "Luke Worrall is the biggest piece of s---," she tweeted in December 2010. "He is the worst thing that ever happened to me ... I have never felt heartbreak like this in my life. I only came home for Xmas to see him meanwhile he has been f---ing hundreds of girls as well as men behind my back."

Sharon Vs. Danii Minogue Though Sharon kept her lips sealed about why she left the British version of the "X Factor" in 2009, but eventually revealed that she split because she was sick of bickering with fellow judge Minogue. "I didn't enjoy working with her at all and the prospect of spending six months sitting next to her, I thought, 'my life is better than that,'" she explained. Oh yeah, she also said the Australian singer had "no sense of humor" and "bad plastic surgery." At the time, Osbourne denied reports that she split because she was jealous of the younger star's looks, saying she didn't hate Minogue because hatred, "Is very close to love and takes a lot of emotion and I don't have that time for her ... she was like an insect, a mosquito that wouldn't go away."

Sharon Vs. Everybody Whether she's defending hard rock hubby Ozzy or her kids, Sharon has never tread lightly when feeling slighted. In March 2009, she was sued
 by a former contestant on "Rock of Love Charm School" who said Sharon battered her while serving as a judge on the VH1 reality show.

She picked a fight
 with Iron Maiden singer Bruce Dickinson in 2005 during the Ozzfest tour when she allegedly had Maiden's P.A. system turned down several times during their set and had people toss eggs at the band on the last date of the outing. The move came in retaliation for what Osbourne said were repeated disparaging comments by Dickinson about Ozzy during the tour.

And, back in April 2003 she got into a scuffle
 with a woman she said illegitimately claimed diamond necklace from a charity raffle she wasn't invited to.