Dolly Parton later told her three million followers the news via Twitter.
“I’m incredibly excited to FINALLY announce that the #BlueSmokeWorldTour is coming to @GlastoFest on June 29th! 😉 Stay tuned for more info…” the country singer wrote.
Dolly Parton will perform in Sunday afternoon’s renowned “legend slot” on the Pyramid Stage, which last year featured fellow country star Kenny Rogers.
Festival-goers enjoyed a mass singalong of Islands in the Stream – his hit duet recorded with Dolly Parton.
Emily Eavis appeared to rule out rumored headline acts Prince, Stone Roses and Fleetwood Mac.
However, she did admit timings were still a work in progress.
Arcade Fire have already confirmed they are 2014’s Friday night headliners for the event.
The Canadian seven-piece revealed the news in December, tweeting a photo bearing the words “June 27 – Glastonbury”.
Lily Allen is among the other acts who have already let slip they will be performing, but Emily Eavis said the remaining headline acts would stay a closely guarded secret for now, and would “be with you in the spring.”
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