The newly-named Tonight Show
host -- who is set to take over for Jay Leno in 2014 -- broke the news
to the Today
show's Savannah Guthrie during an interview scheduled to air next week. "My wife and I had been trying for a while to have a baby," said Fallon, 38, who married Juvonen, 46, in 2007. "We tried a bunch of things. So we had a surrogate."