Happy Birthday, br Jimmy Fallon!.br James Thomas Fallon Jr.br turns 49 years old today.br Here are five fun br facts about the br late night br show host.br 1. His teacher wrote that he would br “replace David Letterman on the 'Late Night Show'” br in his eighth-grade yearbook.br 2. He has his own br Ben & Jerry’s flavor, br The Tonight Dough.br 3. Fallon landed his dream job br when he became a member br of 'Saturday Night Live.'.br 4. He won the Best Comedy Album Grammy br for 'Blow Your Pants Off.'.br 5. Fallon is known for “Jimmy Falloning,” where he breaks character and laughs during his acting.