She'll be the youngest ever Glastonbury headliners when she tops the bill on the Friday night.
It follows rumours there may be a two day event this September.
There are new performance times, new acts and a full schedule.
Set to take place on 22nd May, it will also feature Damon Albarn, Jorja Smith, Kano and Michael Kiwanuka.
The festival has confirmed that this year's event will no longer go ahead.