Pregnant actress Jenna Fischer announced she and husband Lee Kirk are expecting a boy on The Tonight Show on Tuesday.
Fischer leaked the news when referring to the new baby as a “grandson.”
Jay Leno asked Fischer if her parents were thrilled over their first grandchild.
“This is the second grandchild,” Fischer replied, “but first grandson.”
After the slip-up, Fischer confirmed the gender of the baby.
“This is the exclusive, Jay,” Fischer said. “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.”
Fischer also revealed the due date to be September.
“September we’re in what they call the home stretch,” she said.
Fischer, 37, and Kirk got engaged in 2009 while vacationing in Europe and got married last July.