Published Monday, 05 May 2014
The elusive singer has remained largely out of the public spotlight since the huge success of her 2011 album, 21, only appearing at major events and music industry prizegivings.
However, she has given a major hint that she's preparing to return to the limelight after taking to Twitter ahead of her birthday on Monday.
Posting a picture of her in bed, she writes: "Bye bye 25... See you again later in the year."
Fans began discussing what the tweet meant, with many coming to the conclusion that her next record will follow of the form of her previous releases, 19 and 21, by boasting the title 25.
The album's names represent Adele's age when she wrote the songs.