Prince goes Willy Wonka

The star hides lucky 'purple tickets' in copies of new album

Prince is launching his new album with a Willy Wonka-style competition.

The star has aped the book 'Charlie And The Chocolate Factory' by placing lucky purple tickets inside a few copies of new album '3121'.

The tickets will allow the fans who find them to attend a private concert to be held at Prince's Minneapolis home later in the year.

A digital version of the prize is also running, with those purchasing single 'Black Sweat' on iTunes also able to win, reports the Detroit News.

Meanwhile it's believed that Prince is on the verge of announcing a world tour to promote his new record.