The soul superstar is performing on the iconic Pyramid stage at the event for the first time in June (16), and is planning to go incognito to watch her favourite bands without attracting undue attention.

Adele admits that her first choice of fancy dress outfit may be controversial however, as she wants to dress up as her musical idol Beyonce.

According to Britain's Daily Star newspaper she told fans at a concert in London on Tuesday (05Apr16),"I'm going to go in disguise. Obviously on stage I'll be me but when I watch Muse and Coldplay I'll be dressed as someone else. Perhaps as Beyonce, although I'd need to get a spray tan and that wouldn't be considered politically correct."

The Hello singer has named the former Destiny's Child star, who headlined Glastonbury herself in 2011, as her favourite artist, telling Apple Beats 1 radio host Zane Lowe she was team "Queen Bey to the day I die."

As a second choice, she revealed a fishy fancy dress idea to fans at the English capital's O2 Arena, adding, "Or, I was thinking, maybe Ariel the Little Mermaid. No one would recognise me then. I'd go all out with the fish tail and everything!"

Until her presence on the bill was announced last month (Mar16), Adele had previously said she was unlikely to take up an invitation to perform.

However she did tell fans at a concert last month (Mar16) she would attend the festival as a fan and dress up with son Angelo, saying, "Me doing Glasto? I would s**t myself. Best stay away from there. I will be there because I go every year. I'll be dressed as Elsa and my kid will be Olaf."

Adele is currently on a short break from performing after completing the U.K. leg of her world tour. She will begin touring Europe with a concert in Stockholm on 29 April (16).