Lady Gaga has earned herself a large following over the last few years, with a host of celebrity fans to boot. But now she’s landed herself the biggest fan of all – and it’s none other than the Queen of Pop.

Madonna, who has earned her nickname after spending three decades at the top of the pop charts with hits like Material Girl, Papa Don’t Preach, Like a Prayer, Music, Hung Up and 4 Minutes, doesn’t see Gaga as a threat to her position. Instead, she has said she would love Lady Gaga to join her on tour in 2011.

A source close to the singer said: “Madonna is absolutely obsessed with Gaga. She thinks she is the most cutting-edge star to come out of pop in ages and desperately wants to work with her”

Lady Gaga is yet to respond to the invitation but one thing’s for sure – any concert with both Madonna and Lady Gaga is sure to be a record seller.