"My wife Nancy and I welcomed our second child, Frances Cole Fallon! So, welcome to The Tonight Show! I'm your host, completely exhausted," Fallon quipped.
Frances Fallon was born last Wednesday, and will be joining big sister Winnie Rose as the first daughters of Late Night. Speaking of which, Fallon took it upon himself to compare his budding family to another famous first family.
"I just welcomed my second daughter and now live with three females," Fallon joked. "Or as Obama put it, ‘Who’s laughing now, funny man?’”
Even guest Chris Rock got in on the action, telling Fallon that when it comes to children, two is better than one because they'll eventually be able to entertain themselves.
"When you have one you have to be the show," Rock said. "When you got two you're just an usher."
Watch Fallon's monologue below, and click through to see the adorable first pics of Frances Cole Fallon.