The event will take place at a secret location on June 4
'Florence + The Sphinx' is set for release on May 13
Florence + The Machine singer makes one-off, unannounced appearance
Producer has previously worked with Little Mix and Rudimental
The Florence and the Machine frontwoman also performed Gossip's 'Standing In The Way of Control' on Friday night
Florence Welch teamed up with Dev Hynes for a stripped back version of the track
Singer being lined up for 'leading role' in sci-fi franchise, says source
Hear full song taken from 'The Great Gatsby' soundtrack
Liam Gallagher, Frank Ocean and 'The Wire''s Idris Elba also turn out to party after the bash
Singer reportedly treats fans to impromptu performance following Kendrick Lamar gig