Gwen Stefani, Jimmy Fallon and The Roots sang 'Hollaback Girl' on classroom instruments during the Nov. 26 episode of 'The Tonight Show Starring Jimmy Fallon.' The singer released her fourth solo studio album 'Bouquet' earlier this month.

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-stomping track as Fallon and the house band shook tinsel-colored pom poms and performed with a tambourine,

Gwen Stefani joins Jimmy and The Roots to perform her hit song "Hollaback Girl" with classroom instruments. Ryan Kobayashi, who flew to Los Angeles looking for his daughter, Hannah, after she was reported missing, 'tragically took his own life,' according to his family.