British stars Charli XCX, Dave and Raye will headline Reading and Leeds Festival next summer.
Irish rock band Fontaines DC, electronic duo Chase & Status and band Florence + The Machine will also top the bill at both events over the August bank holiday weekend.
It is the first time in 25 years the headliners at the sister festivals are exclusively British and Irish acts, organisers say.
Five-time Brit Award winner Charli XCX's appearances are her only UK festival shows currently scheduled for next year.
Reading and Leeds bosses said the twin events would be the only UK festival appearances for all six headliners next year.
