Simon Helberg and wife Jocelyn Towne attend 20th Annual Screen Actors Guild Awards at The Shrine Auditorium on January 18, 2014 in Los Angeles, California Credit: Mark Davis/

Big Bang baby on the way! Simon Helberg and wife Jocelyn Towne are expecting their second child together -- and it was plain to see the evidence on the red carpet at Saturday's Screen Actors Guild Awards in L.A., where the Big Bang Theory actor and his glowing wife, cradling a lovely baby bump in a draped silver gown, happily faced the cameras.

"Yes, my wife is [pregnant,] I can't take all the credit," Helberg, 33, confirmed to Entertainment Tonight's Nancy O'Dell before the ceremony.

Married since 2007, Helberg and actress Towne welcomed daughter Adeline back in May 2012. And, indeed, Towne sported a baby bump at the 2012 SAGs months before Adeline's arrival.

"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," Helberg (who plays Howard on the CBS smash) joked to O'Dell.