On Sunday, Edith Bowman hinted at the potential special performance when she was asked if she had information on any secret Glastonbury performances.
WATCH: Lady Gaga invites Bradley Cooper on stage for surprise duet in Las Vegas
Glastonbury organizer Emily Eavis took to Twitter on June 24 to shut the rumours down.
“Before this one gets out of control… the answer is no, that isn’t happening. (Although you can watch the amazing A Star is Born in our Pilton Palais cinema tent at 4.30pm on Friday.),” she tweeted.
During an episode of Sunday Brunch, Bowman had previously told hosts Simon Rimmer and Tim Lovejoy that she “may know one” surprise performance but that she “can’t possibly say.”
“On my podcast, I had Bradley Cooper talking about A Star Is Born. And when I spoke to him, I was like: ‘I just wanna see you guys do a gig, play it live.’ And he was like: ‘Jackson’s dead!’” Bowman said.
Bowman responded to Eavis’ tweet, writing: “So sorry this has grown arms and legs. Blame Mr Cooper.”
After receiving some criticism from people on Twitter, Bowman posted a link to her podcast and a photo of herself with Cooper.
“If you’d like to listen to what #BradleyCooper actually said about @GlastoFest & @ladygaga you can listen to his @soundtrackinguk episode here,” she wrote, linking off to her podcast.
Glastonbury Festival 2019 begins on June 26 with Stormzy, The Killers and The Cure set to headline. Other performers include Ms. Lauryn Hill, Sheryl Crow, Janet Jackson, Carrie Underwood, Jorja Smith, Lizzo and Miley Cyrus.
Lady Gaga and Bradley Cooper have not addressed the rumours of the surprise performance as of this writing.