Prince will play his first UK festival show at the Hop Farm in Kent on July 3.
The Tunbridge Wells event will be his first UK concert since his 21-date residency at the O2 arena in 2007.
The 52-year-old’s appearance will add an extra day to the two-day event, where The Eagles and Morrissey will also perform.
Festival organiser Vince Power said he was “really excited” about adding the Purple Rain star to the bill.
“We have worked hard to get the third day up and running and we hope that fans will appreciate the integrity of the bill,” he added.
However, the American pop legend – whose many hits include When Doves Cry, Kiss and Raspberry Beret – has left fans disappointed in the past.
In February, he had been expected at a charity concert in Dallas but pulled out in mysterious circumstances.
He was also due to perform at Dublin’s Croke Park in June 2008, only to cancel shortly before the event.