Just like real-life pairings, some movie couples sizzle -- and others fizzle. But they're not the only ones who suffer! As the audience, we're forced to watch them whisper sweet nothings into each other's ears for hours (emphasis on sweet nothings). Take Chris Evans, Hayden Christensen, Rachel Bilson, and Kelly Clarkson, for example. They're all hot stars who had not-so-hot chemistry with their cinematic matches. Wanna know who their lesser halves are? Keep clicking to find out, and peep our 10 worst onscreen couples!

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