Fans speculated that she was shading the rock band — made up of Billie Joel Armstrong, Tré Cool and Mike Dirnt — who headlined the music festival during the Saturday shows before her performance.

Tré Cool and Billie Joe Armstrong of Green Day perform at the Coachella Stage. Kevin Mazur/Getty Images for Coachella ...

Green Day drummer Tré Cool has responded to Charli XCX by sporting an “Actual Headliner” sash at Coachella this weekend. The ‘Brat’ star ruffled some feathers last week when she was seen ...