02 June 2014 at 12:39 PM

Gwen Stefani Surprises Audience, Sings 'Hollaback Girl' with Pharrell at Hollywood Bowl - Watch Now!

gwen stefani surprises audience performs hollaback girl at hollywood bowl 01

About this photo set: Gwen Stefani exits through the backdoor at the Hollywood Bowl after making a surprise appearance on stage during the Bruno Mars concert with Pharrell Williams on… Read More Here

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