Jimmy Fallon and wife Nancy Fallon welcomed their first child, a baby girl, on July 23 Credit: Dimitrios Kambouris/Getty Images

Jimmy Fallon has a big job ahead of him -- and we're not talking about The Tonight Show! The Late Night host, 38, is taking on first-time fatherhood following the birth of his daughter, his rep confirms to Us Weekly.

Fallon and wife Nancy Fallon (nee Juvonen) welcomed a baby girl on Tuesday, July 23, at 6:21 a.m., the rep tells Us. The little bundle of joy is the couple's first; she joins their golden retriever Gary Frick.

Nancy, 46, co-owns Flower Films with pal Drew Barrymore. She and the former Saturday Night Live comedian have been married since December 2007.

Beginning next year, Fallon will take over for Jay Leno on NBC's The Tonight Show. His spot on Late Night will be filled by fellow SNL alum Seth Meyers.