Jim Parsons autographs the evening's poster at "An Evening with The Big Bang Theory"

Kaley Cuoco with her father, Gary

Jim Parsons at "An Evening With The Big Bang Theory"

Kunal Nayyar at "An Evening With The Big Bang Theory"

An Evening With The Big Bang Theory atmosphere

An Evening With The Big Bang Theory atmosphere

Johnny Galecki, Jim Parsons, Kaley Cuoco, Simon Helberg and Kunal Nayyar of The Big Bang Theory