Other artists set to perform include Kasabian, Sigrid, Blossoms, and more.
Capaldi's 77 consecutive UK Top 10 weeks are a new best for a solo artist.
The star-studded event will take place virtually on December 10.
Lionel Richie and Duran Duran are also on the bill at the star-studded event due to run from June 30 to July 4 next year.
Lewis Capaldi, Taylor Swift and The Weeknd are also in contention for the 'Best International Artist' ARIA.
Lewis Capaldi and Celeste will be playing special livestreamed gigs on October 9 to help raise money for the UK's grassroots music venues.
Capaldi's 'Divinely Uninpired To A Hellish Extent' also recently secured one million charts sales in the UK, and has yet to exit the Top 10 since its release in May last year.
The album has spent its entire 68-week chart run inside the Top 10.
The festivals, taking place August 27-29, will return with two main stages and six headliners.
The playlist, which compiles the most-streamed songs of the season, also includes tracks from The Weeknd, Drake, and Lewis Capaldi.
The song arrives as the young Scottish singer-songwriter has been nominated for a VMA for PUSH Best New Artist.
Billie Eilish, The Weeknd, and Taylor Swift are also up for multiple moon man statues.
The BRIT Award-winning artist lends her soulful voice to the timeless classic.
Next year's festival will run from July 22-25, 2021 at the event’s usual Suffolk location of Henham Park.
The singer-songwriter created an epic homemade workout video for the remix of his chart-topping single.
The campaign comes as the live industry faces a continuing lack of financial support or guidance during its extended closure.