This is going to be either fantastic or terrible. 

Madonna is being lined up to perform a tribute to Prince at the Billboard Music Awards later this month.

Details of her tribute are being kept a 'closely-guarded secret', but it'll take place on May 22nd in Las Vegas.

Other performers on the night - not related to Madge's Prince bit - include Justin Bieber, Celine Dion, Britney Spears and Demi Lovato.

She hinted at the tribute on Instagram with a cryptic caption that read: "Don't Reign on my Parade!. This is not a Love Song", accompanied by a purple heart emoji, an umbrella emoji and a crown - so we can assume that she will probably tackle 'Purple Rain'.

Last week, she posted a picture of the star to Instagram, with the caption: "Its been 7 hours and 13 days since you took your love away..........all the flowers you planted died when you went away..........Nothing Compares 2 U"