“Don’t tell anyone I told you,” she said during a performance at the O2 Arena. “I think it’s a secret.”
But it’s no longer a secret, as reps for the festival confirmed the news via Twitter just after the singer belted out the news to the arena.
The “When We Were Young” singer will be headlining the Pyramid Stage, the show’s most prestigious venue, on June 25. This will be the first time Adele has performed at the music festival.
But this isn’t the first time the singer has revealed a mid-concert surprise. Just two days ago, the 27-year-old emotionally opened up to her fans during her concert that her 3-year old son, Angelo, was watching her perform.
On another night, as she sang “Make You Feel My Love,” she spotted a marriage proposal in the crowd and interrupted her song to point out that a couple had just gotten engaged. She then invited them onstage and thanked them for “the most beautiful thing” she’s ever witnessed at her shows.
The “25” singer will be concluding her eight-night residency at London’s O2 Arena on April 5.
The Glastonbury Festival runs June 22-26 in Somerset, England. The U.S. leg of her tour begins July 5 in St. Paul.