Latitude organisers have confirmed Thom Yorke will play an intimate gig on the festival's 10th anniversary.
The Radiohead frontman will play at the iArena stage at 12.30am tomorrow.
The confirmation came after Yorke's long-term collaborator and producer Nigel Godrich teased fans by tweeting a picture of the cover for the singer's latest solo album, Tomorrow's Modern Boxes, with the Latitude logo emblazoned across it.
Festival goers had been anticipating more 10th birthday treats after last night's late-night surprise set from Ed Sheeran.
The local hero delighted around 3,000 fans lucky enough to make it in to one of the site's smaller stages, deep in the woods at Henham Park, Suffolk.
The singer-songwriter's set continued the festival's long tradition of unannounced shows, with Rudimental and Lily Allen performing in recent years.
Revellers enjoyed clear blue skies and bright sunshine on the first two days of the festival.
Many cooled down by swimming in the site's lake which organisers have opened up for the first time this year.
Among the scheduled musical highlights today are trip hop pioneers Portishead, headlining the Obelisk arena.
Last night Alt-J drew the biggest main stage crowd of the festival, playing a hit-packed set spanning their two albums.
Elsewhere electronica producer Jon Hopkins, who has worked with Coldplay, wowed dance fans with a spectacular audio-visual display on the 6 Music Stage.
Earlier, Malian rockers Songhoy Blues had a late afternoon crowd dancing in unison to African rhythms and heavy blues riffs.
But it was Sheeran's set that proved the highlight for many of the festival's younger attendees.
Olly Gregson, 18, from Sussex, said: "it was an amazing show, really intimate. Everyone was dancing and singing along. That's the best time I've ever seen him, just because it was so small. You see him in stadiums, arenas and stuff, but it's obviously amazing, the intimacy, so close to it."