It looks like ex-lovahs Justin Timberlake and Cameron Diaz will be reuniting on the big screen in the upcoming flick "Bad Teacher." Cameron will play a scheming, sailor-mouthed middle-school teacher who gets dumped and goes after Timberlake, the school's model instructor. Model instructor? This will actually be the first time they have acted together in the flesh, though they both did voices in "Shrek." For this movie, can they put aside the breakup hurt and rekindle the chemistry that kept them together for four years? And how will Jessica Biel handle that? [People]

Oh, but they're not the only Hollywood lovelies who've been forced to share screen time with an ex. Here are a few more of our favorites.