The star, who has had four number one hits in the UK, including Hold My Hand, will take to the stage for the charity music event on Saturday 16 July.
She will be supported by X Factor singer Fleur East for the event at Howard Davis Park in aid of Help a Jersey Child and Teenage Cancer Trust Jersey Appeal.
Also warming up the crowds will be 2014 X Factor winner Ben Haenow plus singing duo Reggie ‘n’ Bollie who were runners up on last year’s series of the talent show
The announcement comes after Folklore organisers revealed that The Charlatans and The Levellers will perform at their event on Sunday 12 June.
Meanwhile, the acts for Sure’s Legend in the Park, which takes place on Friday 15 July, will be announced next Friday.
The Big Gig is sponsored by Sure, Coca Cola and Condor Ferries as well as Channel 103 and TPA.
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