Beyoncé wasn't the only surprise guest  at Coachella over the weekend — Gwen Stefani  made an unexpected appearance on stage as well! Gwen popped up in a L.A.M.B. collection jumpsuit to sing "Hollaback Girl" with Pharrell Williams, who had already brought out Nelly and Snoop Dogg during his main-stage set on Saturday. Gwen's Coachella moment was even more exciting, since it was her first public outing after giving birth to her third child with husband Gavin Rossdale , Apollo Bowie Flynn, in February. Just six weeks after welcoming the baby boy, Gwen rocked the stage with one of her biggest hits, making for a seriously fun sing-along with the crowd.
See more celebrities at Coachella  weekend one!