February 25, 2014 06:15 PM

Steve Granitz/Wireimage

Jenna Fischer is pregnant!

The former Office star and husband Lee Kirk are expecting their second child this summer, her rep confirms to PEOPLE.

The couple are already parents to son Weston Lee, 2½.

“I had really underestimated what I was capable of because, before I had him, I thought I needed things that I didn’t really need,” Fischer, 39, joked to PEOPLE last year.

“I want nine hours of sleep, but it turns out I don’t need it!”

She and Kirk, 42, a writer and director, tied the knot in July 2010 during a ceremony that Office costar Rainn Wilson called “the most beautiful wedding I’ve ever experienced.”

“It looks like I need to get some new goals because I’m living my dream right now,” Fisher told PEOPLE in 2012.

“[My husband] is amazing. He’s such a good father. I’m very lucky. I came to Los Angeles and wanted more than anything to be on a comedy TV show like Cheers. My other goal was to marry a great man and have a family.”

— Dahvi Shira with reporting by Julie Jordan

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