Gwen Stefani, Jimmy Fallon and The Roots sang 'Hollaback Girl' on classroom instruments during the Nov. 26 episode of 'The ...

The Tonight Show just debuted a new installment of Jimmy Fallon's popular “Classroom Instruments” series—this time with Gwen ...

Gwen Stefani performs stripped-down version of solo hit 'Hollaback Girl' on classroom instruments with Jimmy Fallon and the Roots on 'Tonight Show.' ...

Gwen Stefani ain't no hollaback girl. On Tuesday, Nov. 26, the "Cool" singer, Jimmy Fallon and The Roots jammed out to her 2004 hit song "Hollaback Girl" on classroom instruments — and it was ...

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 ...

Gwen Stefani's "Hollaback Girl" is a sassy spelling lesson, so it's fitting that she'd finally take it into the classroom. In ...

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 ...

Gwen Stefani and The Roots on 'The Tonight Show Starring Jimmy Fallon' Gwen Stefani ain't no hollaback girl. On Tuesday, Nov. 26, the "Cool" singer, Jimmy Fallon and The Roots jammed out to her 2004 ...