British pop star Adele has announced she will headline the Pyramid Stage at this year's Glastonbury Festival. The Hello singer revealed the news live on stage at London's O2, where she is in the middle of a six-night residency.

"I wanted to do it last year but my record wasn't ready," she told her fans.

Glastonbury immediately confirmed the announcement. "What a great honour it is to have the wonderful Adele confirmed for this year's Saturday night headline spot!" said festival organiser Emily Eavis.

Earlier this week, the singer teased fans in Manchester that she would "see them at Glastonbury" even if nerves prevented her from performing. "I'll be dressed as Elsa and my kid will be Olaf," she said, referencing Disney's smash hit movie, Frozen.

The 25-year-old singer joins Muse and Coldplay at the top of the bill. The pop star previously played Glastonbury at the beginning of her career in 2007 when Arctic Monkeys, The Killers and The Who were headliners.

The news was met with a mixed reaction on social media, but anticipating the backlash the outspoken singer made her feelings very clear. "And to the people who say I am too boring to headline, you're more f**king boring for moaning about me headlining."

Adele will be headlining on Saturday (June 25) – in between Coldplay on Friday (June 24) and Muse on Sunday (June 26).

Jeff Lynne's ELO have been announced for the Sunday afternoon "legends" lot, which in recent years has been filled by Dolly Parton, Lionel Richie and Kenny Rogers. PJ Harvey is the only other confirmed act on the bill. The festival traditionally waits until the final tranche of tickets have been sold before revealing its full line-up.

Adele' is the best selling artist in the world today, with her latest album, 25, selling more than 19 million copies worldwide.

This year's Glastonbury festival takes place in Somerset from 22 to 26 June.

Adele, Muse and Coldplay are headlining Glastonbury. 2 dad bands and an artist for the women going through a mid life crisis.

— jamie (@jmbryn) March 18, 2016

Adele headlining Glastonbury?

— Same old Disco (@NiamhMcCarrick) March 18, 2016

Adele headlining #Glastonbury? What is the world coming to? I despair.

— Al McDougall (@AlasdairMcD) March 18, 2016

I swear if Adele headlines Glastonbury and it isn\'t Radiohead, I won\'t know what do with my life

— Man With Beard (@RyanHudson2009) March 18, 2016