June 25, 2014 10:15 AM

Kevin Mazur/Wireimage

It’s a boy for Simon Helberg.

The Big Bang Theory star and wife Jocelyn Towne welcomed son Wilder Towne Helberg on Wednesday, April 23, his rep confirms to PEOPLE.

The new addition joins big sister Adeline, 2, at home.

“She loves him and wants to hold him, but he’s too big, so she just holds his head and rocks him and sings him songs,” Towne, 37, joked on The Talk on June 12.

Helberg and Towne announced the pregnancy in January at the Screen Actors Guild Awards, when she stepped onto the red carpet with a visible bump.

“Yes, my wife is [pregnant] — I can’t take all the credit,” the actor, 33, joked at the time.

The couple recently collaborated on I Am I, a film which Towne wrote, directed, starred in and executive produced, while her husband also executive produced and appeared.

— Sarah Michaud

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