She will make her Glastonbury debut in June - the festival's 50th anniversary - headlining the Pyramid Stage.

Swift announced on Twitter that she was "ecstatic", while holding up a photo of the festival's in-house newspaper with the headline: "Sunday Night Taylor Made For Glastonbury."

Festival organiser Emily Eavis simply responded: "Taylor! Yes!"

Swift, who performed on this weekend's Strictly Come Dancing final, joins previously-announced Saturday night headliner Paul McCartney; and Motown star Diana Ross, who will play the Sunday afternoon "legends slot".

She is the first female artist to top the bill since Adele in 2016.

Glastonbury founder Michael Eavis said he was excited to welcome the singer to Worthy Farm next year.

"She's one of the biggest stars in the world and her songs are absolutely amazing," he said. "We're so delighted."

Taylor Swift will join Paul McCartney and Diana Ross in headlining Glastonbury festival on its 50th anniversary

Friday's headliner is still to be revealed but festival organiser Emily Eavis recently said it would be a male artist, playing the festival "for their first time".

Many Glastonbury-watchers expect the slot to be taken by US rapper Kendrick Lamar.

The festival sold out in just 34 minutes when tickets went on sale in October. A resale for unwanted and unpaid tickets will take place on April 16, 2020 for coach tickets and April 19 for general tickets.

Swift topped the charts everywhere from the UK to China with her seventh album, Lover, earlier this year. It has since become the only album of 2019 to sell more than one million "pure" copies - ie CD, vinyl and downloads, not including streams - in the US.

The star, who celebrated her 30th birthday on Friday with a Christmas-themed party, recently announced a new approach to touring for 2020.

After 2018's ambitious, 53-date Reputation stadium tour, which played to 2.8m fans and took $345.7m (£259.3m) at the box office, she's taking her show to festivals around the world, in an effort to meet new and unfamiliar audiences.

"The Lover album is open fields, sunsets, and summer," she wrote on social media. "I want to perform it in a way that feels authentic. I want to go to some places I haven't been and play festivals."

The star will play one further date in the UK next summer: At London's BST festival in Hyde Park.

However, general admission tickets for the show sold out within hours of going on sale earlier this month.