January 27, 2012 05:00 PM

Gregg DeGuire/Picturegroup

A Big Bang baby!

Simon Helberg, who plays Howard Wolowitz on the show, and wife Jocelyn Towne, 35, are expecting their first child this spring, their rep confirms to PEOPLE.

The actor, 31, and his wife, an actress/writer/director, were married in 2007.

Helberg’s hit sitcom is up for Outstanding Performance by an Ensemble in a Comedy Series at Sunday’s Screen Actors Guild Awards.

— Sarah Michaud with reporting by Monica Rizzo

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