Jenna Fischer Reveals Upcoming Baby’s Sex on Leno Show

, the American actress best known for her role as Pam Halpert on NBC’s hit comedy series “The Office,” has revealed she is pregnant with a baby boy.

Fischer, 37, let the news slip during her appearance last night (July 19) on ‘The Tonight Show’ with Jay Leno.

When TV host Leno asked the star if her parents were excited about their first grandchild, she corrected Jay by saying, “This is the second grandchild, but first grandson.”

When Leno jumped at the unexpected news, Fischer quickly added:

“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.”

Fischer, who first announced the pregnancy in May, also revealed the baby is due in the fall, saying, “September we’re in what they call the home stretch”

In addition to preparing for the new budnle of joy, Jenna is currently promoting her new movie ‘A Little Help’ which hits theaters July 22.

You can watch the first part of Fischer’s Tonight Show interview below: