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

<div class="meta "><span class="caption-text ">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&#39;s PaleyFest honoring the CBS show &#39;The Big Bang Theory&#39; at the Saban Theatre, courtesy of Samsung Galaxy, on Wednesday, March 13, 2013 in Los Angeles. (Kevin Parry for Paley Center for Media)</span></div>
March 15, 2013 10:45:31 AM PDT