ET FIRST: Simon Helberg & Wife Expecting a Baby

The Big Bang Theory star Simon Helberg has revealed to ET exclusively that he and his wife, Jocelyn Towne, are expecting their second child!

The news came as Helberg spoke to ET's Nancy O'Dell on the red carpet of last night's Screen Actors Guild Awards in Los Angeles.

"Yes, my wife is [expecting,] -- I can't take all the credit," Helberg said. "Every time I come to the SAG Awards there's something about this night...About 8 months before [the SAG Awards] I get really the urge, I feel the romance and then we get nominated so it's hand in hand."