Gwen Stefani and Jimmy Fallon Reimagine 'Hollaback Girl' Using Classroom Instruments — and It's Bananas Jimmy Fallon Jokes He ‘Steals’ Children’s Books Ideas from His Own Kids ...

Gwen Stefani stepped into a time machine with Jimmy Fallon and the Roots on The Tonight Show to perform her 2005 hit "Hollaback Girl." Using a banana as a microphone, The Voice host sang the foot ...