Green Day's Billie Joe Armstrong donned a festival-goer's 'Brat' hat during their Coachella set after Charli xcx's subtle dig at the pop punk veterans headlining over her.
After donning a 'Miss Should Be Headliner' sash at an afterparty after the 'Von Dutch' hitmaker performed on the main stage before headliners Green Day at Indio's Empire Polo Club in California on April 13, weekend two saw frontman Billie Joe poke fun at the 'Apple' singer during their performance on April 19.