Geena Davis -- one of the most famous members of the super-smart brainiac group Mensa -- is finally revealing the trick to getting in her club ... and the advice is so incredibly simple, it can only be described as GENIUS!!!
Davis was heading into the White House Easter Egg Roll when she dropped those few precious words of knowledge on an inquiring photographer.
Geena Davis -- Wanna Get Into My Genius Club?!
4/26/2011 3:20 PM PDT BY TMZ STAFF
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