Other acts added to the bill include Connie Constance, Mathilda Homer and CC Honeymoon.
The show takes place in central London on Saturday 13th July and tickets are on sale now.
The event’s other dates this summer are headlined by Robbie Williams, Celine Dion, and Barbra Streisand.
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Whitney, Boy Azooga and Let’s Eat Grandma also impress.
Her swansong performance for the ‘High As Hope’ run is just as hypnotic and emotive as her first.
The Big Moon, Villagers, Self Esteem and more have been added to the line-up.
Grab yourself a birthday box set full of Florence-themed goodies.