She also debuted a previously unheard track featuring Charli XCX and Raye called Girls, bringing both stars on stage.
"It was the first time I have played either of those live," she tells Newsbeat after her set, in blazing sunshine.
"I wanted to do that because I wanted to give the listeners just a little taster of the brand new stuff."
She admits she had no idea how the crowd would respond.
"I haven't done something like that in two years or something," she says.