Happy Birthday, Jimmy Fallon!.br James Thomas Fallon Jr.br turns 45 years old today.br Here are five fun br facts about the br comical late night br show host.br 1. His teacher wrote that he would br “replace David Letterman on the 'Late Night Show'” br in Fallon’s eighth grade yearbook.br 2. He has his own br Ben & Jerry’s flavor, br The Tonight Dough.br 3. Fallon landed his br dream job when he br became a member of br "Saturday Night Live.".br 4. Fallon won the Best Comedy Album Grammy br for ‘Blow Your Pants Off.’.br 5. He is known for “Jimmy Falloning,” where he breaks character and laughs during his acting.