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'Big Bang Theory' cast celebrates four years at PaleyFest (Photos)

Pictured L to R: Jim Parsons, Mayim Bialik, Kunal Nayyar, Kaley Cuoco, Johnny Galecki, Simon Helberg and Melissa Rauch attend the Paley Center for Media's PaleyFest honoring the CBS show 'The Big Bang Theory' at the Saban Theatre, courtesy of Samsung Galaxy, on Wednesday, March 13, 2013 in Los Angeles. <span class=meta>(Kevin Parry for Paley Center for Media)</span>
March 15, 2013 10:45:31 AM PDT