Simon Helberg, Jocelyn Towne

Jason LaVeris/FilmMagic

Simon Helberg has a big reason to celebrate when Father's Day rolls around next month...the Big Bang Theory star is officially a dad!

The 31-year-old thesp and his actress wife, Jocelyn Towne, welcomed a baby girl last Tuesday, E! News has confirmed.

So what's the little angel's name?

Say hello to Adeline!

"The family is thrilled," a source told Us Weekly. "Simon is excited to be a father—he's been doing his reading."

This is the first child for Helberg and Towne, who tied the knot in July 2007.

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