The Office star confirmed in May (11) she is expecting her first child with husband Lee Kirk, who she married last year (10).
Now Fischer has revealed the gender of the tot, who is due in September (11).
When U.S. TV host Jay Leno asked the star if her parents were excited about their first grandchild, she replied, "This is the second grandchild, but first grandson. This is the 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.
"(In) September we're in what they call the home stretch."