The 18 dates join a previously announced UK and European tour
Seal, Gaz Coombes, Kate Nash, Soft Play and more will serve as opening support
Tickets go on general sale later this week
The pop star is set to headline the summer series on July 6
Nash also said the song was about "reassessing past behaviors and current priorities. You know you’re on empty when you’re spewing up bile"
The song is about the artist "unexpectedly" falling in love, and comes with a horror-themed video
Her new album is said to draw on “inspiration from old Hollywood glamour, vintage musicals, and the relentless pursuit of beauty in a chaotic world"
The singer-songwriter has also announced a London headline show
They join Stormzy, Chase & Status and Becky Hill on the packed line-up
Cat Burns, Natasha Bedingfield, and Kate Nash have also been confirmed for the August event