The show takes place while she's over for Reading & Leeds.
New artists revealed include Sam Fender and Megan Thee Stallion.
The song was previewed at her first Coachella appearance at the weekend, and features a sample of Jodeci's 'Freak'n You Remix'.
It's the first taster of Megan's new album.
The track will arrive on Friday, 11th March
There's no title, but it's coming this week.
Other new artists joining the bill include Big Thief, Little Simz, Mitski, PinkPantheress, Sky Ferreira and more.