ABC, Getty Images, WireImage

Don't let those smiling faces fool you—it's not all rainbows and sunshine when it comes to these celebs (and whatever you consider Donald Trump). Nope, these folks participated in some of the biggest, the nastiest and—we'll admit it—the most entertaining feuds of 2012.

What went down this year? There were courtroom cat fights (me-ow, you devilish Desperate Housewives), on-set antics (the claws came out on American Idol) and a little invention that sparked about nine million word wars: Twitter.

We now continue our annual Best of the Year blowout with a countdown of the biggest fights of the year.

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