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

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Gwen Stefani stepped into a time machine with Jimmy Fallon and the Roots on The Tonight Show to perform her 2005 hit ...

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'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 ...

With Fallon pounding on a drum and shaking tinsel-decked percussion instruments, Stefani sang the beat-heavy “Hollaback Girl” into a banana-shaped shaker as the veteran hip-hip group buzzed on ...

The singer revisited the iconic hit from her 2004 debut solo album on Tuesday night's (Nov. 26) "Tonight Show." ...

The singer released her fourth solo studio album 'Bouquet' earlier this month Todd Owyoung/NBC via Getty Jimmy Fallon, Gwen Stefani and The Roots on 'The Tonight Show Starring Jimmy Fallon' Gwen ...

The Voice coach Gwen Stefani had a tough decision to make Tuesday during the first night of the Playoffs.