Singer had been rumoured to be making live return at 2015 festival
Photo was uploaded by star to her Instagram account yesterday (January 22)
The follow-up to 2011's '21' is mooted for release later this year
Singer is understood to have "made a donation" to charity in lieu of recording vocals for the single
Chris Martin, Ed Sheeran and One Direction all performing on the charity single
The singer is alleged to have not replied to Collins' interest in a collaboration
The singer's record label say 'There will not be a further new release by Adele during 2014'
Singer sued picture agency over photos of one-year-old Angelo Adkins taken in a playground
Martin Mills of Beggars Group says there is "no truth" in speculation
OneRepublic's Ryan Tedder and Phil Collins have both claimed they are writing with the singer
One Republic frontman worked on both Adele's second album '21'
Court confiscates over 200 albums as punishment for playing the singer at a "prominent, intrusive and very high level"
Singer-songwriter claims he is working on follow up to '21'
The singer was named in the Queen's Birthday Honours list for services to the music industry
'21' singer given the title Miss Adele Adkins MBE by Prince Charles at Buckingham Palace
Singer is being celebrated for services to the music industry
London singer ahead of Susan Boyle, Mumford & Sons and Taylor Swift in list
However, Adele has threatened to sue if he ever plays it to anyone
Elton John has reportedly told the 'Skyfall' singer to accept an offer to perform in the Sin City
Adele is reportedly attached to star as Springfield in a film set in the late '60s