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Richard Simmons

GaGa Over

Anderson Cooper!

6/19/2009 12:44 PM PDT BY TMZ STAFF

Anderson Cooper was outed as a Lady GaGa fan last night -- and the eternally short-shorted Richard Simmons didn't miss a beat challenging him to a "Just Dance" dance-off.

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Cooper didn't take the bait, but the 100% authentic awkwardness is just as entertaining ... if not more.

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