Jeff Labrecque
July 20, 2011 AT 01:40 PM EDT

The Office‘s Jenna Fischer, who’s expecting her first child in late September, revealed to Jay Leno last night that she and husband Lee Kirk will be having a boy. “This is the second grandchild [for my parents],” Fischer said, “but first grandson. This is exclusive, Jay… When I went to my movie premiere the other day, a reporter asked me if I knew what I was having, and I said I do, but I’m not sharing that yet because I’m [going to] have Jay be the first to know.”

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