Adele was “panic stricken” with nerves ahead of her headline Glastonbury set in 2016, according to Jo Whiley.
The singer performed to thousands on the Saturday of the festival but stage fright kicked in before she was due to perform.
BBC Radio 2 presenter Whiley, who interviewed the Hello singer shortly before the set, told The Sun's Bizarre column: "She was really scared, really, really scared. We were doing the interview and at one point she had to stop as she was in tears."
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The mother-of-one told the host the festival meant a lot to her as she'd been going since she was a child.
"She was just so stricken with nerves, absolutely panic stricken," Whiley went on.
She added: "It was amazing to see somebody like that, then to witness her walking out on stage and doing the most incredible set… to know that half an hour before she’d been in tears at the thought of walking out there."
During her performance, Adele, 32, told the crowd it was "the best f*****g moment" of her life.
The five-day festival was due to take place this week from 24 - 28 June but was cancelled for 2020 due to the coronavirus pandemic.
The BBC are showing coverage highlights from the festival over the years in The Glastonbury Experience which will be available across TV, iPlayer, radio and the Sounds app.
Upon announcing the postponement, organisers Michael and Emily Eavis confirmed that tickets purchased for this year would be honoured in 2021.