McFly had egg on their faces as they became choc stars for the day.
The quartet, famed for songs such as Five Colours In Her Hair, had white and yellow streaks in theirs as they were drizzled with sticky fondant.
The band - who have notched up seven number ones including All About You - are plugging Cadbury's Creme Eggs by taking on a series of "Goo Dares Wins" challenges.
They will be egged on by members of the public to take part in a series of dares - from bathing in Creme Egg fillings to having their legs waxed.
Fans can vote on the challenges they want to see them complete - and which of the band should take part - at www.cremeegg.com until the stunts end on April 24.
The extra exposure may help them to sell more copies of their album.