WATCH: Celebrities Try To Sing Kelly Clarkson' "Since U Been Gone"

Singers sing, actors act, comedians try and make us laugh, right?  Why would they try and do something different?  "Tonight Show" host Jimmy Fallon challenged a bunch of actors, comics, and even singers to try singing the Kelly Clarkson hit, "Since U Been Gone."  How did it go?  Just about how you would think.  Check it out, and don't say you weren't warned.



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