Music
The singers will join Bananarama, The Noisettes and Beverley Knight for the "ultimate girls night out" at Friday's Big Top on June 12.
Newcomer Pixie Lott will kick off the event, which will also see a live set from folk artist Eddi Reader.
Human League were previously announced as the headlining act on "campers only" Thursday, while Stereophonics, The Prodigy and Neil Young will perform over the weekend.
Isle of Wight takes place between June 11 and 14 at Seaclose Park, Newport.
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