The Office’s Jenna Fischer Welcomes a Baby Boy!

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Break out the blue cigars!

The Office star Jenna Fischer and her husband, Lee Kirk, welcomed their first child, a son named Weston Lee, on Sept. 24, Us Weekly can confirm.

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The 37-year-old Fischer broke the news of her baby's gender on The Tonight Show in May. "This is the second grandchild [for my parents]," Fischer told Jay Leno, "but first grandson."

Fischer's pregnancy was written into The Office's script, with her character Pam — already the mom of a little girl — expecting a son with TV husband Jim Halpert.

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"Pam and Jim snuck away last season on Valentine's Day, and they had sex," Fischer told New York Magazine prior to the show's current season premiere. "The story is that they conceived this baby at that time and were keeping it a secret until we come back from the summer."

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"When we started shooting that episode, I thought to myself, 'If everything goes well, this is going to be a very, very convenient coincidence,' and I think I found out I was pregnant when we were shooting that episode," she added.

Fischer and her husband were married in Malibu, Calif., in July 2010 in a ceremony officiated by Survivor's Jeff Probst.

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