Gwen Stefani Unexpectedly Pops in During Blake Shelton’s Set at Watershed Festival: Watch

Jamie McCarthy/Getty Images for NBC

Gwen Stefani performs on The Tonight Show Starring Jimmy Fallon at Rockefeller Center on Nov. 21, 2017 in New York City.

Gwen Stefani made fans go bananas at the opening night (Aug. 3) of the Watershed Music and Camping Festival in Washington.

Stefani’s unexpected pop-in arrived during her boyfriend Blake Shelton’s Saturday headlining set at the three-day event.

While on stage, Stefani led the crowd in an energetic sing-along of her 2005 hit “Hollaback Girl.” Watch the ecstatic Watershed crowd belt out the song’s famous line, “Let me hear you say, this shit is bananas, B-A-N-A-N-A-S!” in the clip below.

Watershed wraps Sunday night with performances by Brett Young, Cole Swindell, and Brad Paisley.

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