A rare signed 12” copy of Madonna’s 1985 single Crazy For You is being auctioned for the charity CharityStars.

The single, which is signed in silver pen on the vinyl itself, was donated to the charity. CharityStars is an umbrella organisation for global charities who lack sufficient ambassadorial and corporate support. Its patrons include Lionel Messi, Bobby Charlton, David Coulthard and Sara Cox.

Bidding on the single ends on August 4 and currently stands at £460. The single has an estimated value of £2,000. Bids can be placed via CharityStars’ website: www.charitystars.com

Meanwhile, Madonna starts her five-month world tour for her Rebel Heart album on September 9, with the first show in Montreal. The tour reaches Britain in December, with dates at London O2 (December 1-2), Manchester Arena (14), Birmingham Barclaycard Arena (16) and Glasgow SSE Hydro (20). Madonna unveiled two teaser videos for the tour this week, which hint the set will include poledancing nuns and fighting pirates.