AceShowbiz - Gwen Stefani stole the show at a festival in Washington on Friday, August 03 after crashing boyfriend Blake Shelton's set to perform a few of her own songs.
Shelton headlined the first night of the three-day 2018 Watershed Music and Camping Festival, but it was Gwen who sent fans into a frenzy by bounding out onstage in the middle of her man's concert.
Video footage of the event shows the No Doubt frontwoman amping up the crowd as she prepares to launch into her 2005 smash hit, Hollaback Girl, as the audience screams in delight.
Stefani has become a regular special guest at Blake's concerts since they began dating in 2015, but she has been focused on her own gigs of late, after launching her first Las Vegas residency show at the Zappos Theater at Planet Hollywood Resort & Casino in June.
She wrapped up the first leg of her Gwen Stefani: Just a Girl shows last month.