The real reasons Kelly Osbourne and Christina Aguilera hate each other

Television personality Kelly Osbourne and pop star Christina Aguilera have hated one another for years. What happened, and why does it seem so one-sided? (Spoiler alert: Because, for the most part, it is.)

Osbourne started it

In a 2002 episode of the reality series The Osbournes, Kelly Osbourne derided Christina Aguilera's My Kind Of Christmas album. After imitating the singer's trademark melismatic vocals, Osbourne groans, "I'm not kidding, I wanted to f—ing stab myself." Pretty harsh words coming from someone who has more tattoos than album sales of her own, eh?

Osbourne kept it going

Osbourne continued her tirade against Xtina for more than a year. The celebuspawn told the press, "She's one of the most disgusting human beings in the world." She also added, "I've seen drag queens who look better." But lest we forget, Osbourne insists that Aguilera is the bully. Right.

Aguilera confronted her

At the American Music Awards in January 2003, Aguilera told Access Hollywood, "Personally I think [Osbourne] has a crush on me, because she seems so obsessed with talking about me…I tried to confront her at a club, I think, and she just totally backed up, she was just like, 'I don't have anything to say about you, blah, blah, blah. That's not me, that's my mother.' When I confronted her in person she really had nothing to say, so I don't know."

They flipped out at each other

MTV News reports that at the 2003 MTV Europe Music Awards, Aguilera refused to walk the red carpet at the same time as Osbourne. Osbourne responded by calling Aguilera's music "crap" and saying the songstress was a "cow." Aguilera poked fun at Osbourne's hatred in a pre-taped sketch in which she tossed darts at a photo of the then-reality starlet. That didn't sit well with Osbourne, who carped to MTV, "If Christina Aguilera has to resort to throwing darts at my head after everything she's achieved and everything she's done, then she's a really sad, sorry person, and I take it as a complete compliment." Aguilera retorted onstage, saying, "I didn't know it was still Halloween…Honey, if you can dish it out, you've gotta learn how to take it back."

Aguilera bought the Osbourne family house

The beef simmered quietly for a few years after The Osbournes was cancelled, until 2011, when Aguilera purchased the Osbournes' Beverly Hills home, which was featured on their TV show, for $11.5 million. She sold it two years later for $13.5 million. Did Aguilera truly want the mansion, or was she simply flexing her financial muscles? Regardless, Osbourne was not happy about the real estate affair.

Osbourne body-shamed Aguilera

In August 2011, Osbourne decided she was still mad at Xtina. On an episode of Fashion Police (via Us Weekly), Osbourne barked about Aguilera's weight gain, saying, "Maybe she is just becoming the fat b— she was born to be. I don't know. She was a c— to me. And she bought my house!" She added, "She called me fat for so many f—ing years, so you know what? F— you! You're fat too."

Osbourne stood by her message

In a guest editorial for Glamour in April 2012, Osbourne stood by her decision to body-shame Aguilera because, she claimed, Aguilera started it more than 10 years ago. "I call myself an FFP: Former fat person, and when you're an FFP, you will always see in yourself what people used to bully you for," she wrote. "Sometimes it's other people's voices you have to shut out. That's what happened with me and Christina Aguilera, which people don't understand. She called me fat for years. One night on Fashion Police I said, 'F— you. Now you're fat too.'…I said, 'Now you know how it feels.' And I'm sorry, but I stand by that."

She continued, "I make a point on the show never to say anything about anybody that I wouldn't say directly to their face. I'm famous, and she's famous; it doesn't mean I can't stand up for myself. I took it for 10 years and finally decided to be like, 'You know what? I'm done.' And that's the last thing I will ever say about it."

Osbourne finally got over it...maybe

After her Glamour editorial received a healthy amount of backlash, Osbourne appeared on Watch What Happens Live and accepted a challenge from host Andy Cohen: say three nice things about Aguilera. With a completely straight face, Osbourne muttered (via Us Weekly), "I think she's looking way better right now. She's got a great voice and she's got a beautiful son." Sure, it was slightly backhanded, but only a little. It seems the bully is in the bottle, at least for the moment.