The 68-year-old performer, who is most well known for hits 9 to 5, Islands in the Stream and I Will Always Love You will sing for the wellie-wearing festival goers as part of her Blue Smoke World Tour, which comes to Europe on 8 June.
Debbie Harry of iconic 70s band Blondie has also confirmed that the group will be appearing at the festival.
The 68-year-old star said, “We just heard today – we’re going to be doing Glastonbury” at last night’s NME Awards, where she performed and accepted NME’s godlike genius award.
Glastonbury Festival will be on between 25 and 29 June 2014.
Ellie is an entertainment, TV and film journalist writing news and (hopefully incredibly witty) comment for RadioTimes.com. She loves light-hearted dramas and glossy US series - and is more than a little bit obsessed with Downton Abbey. Foodie, sun-seeker and aspiring novelist in her own time. Likes the fact that her name rhymes with telly.