The "MDNA" album may not have been a big success, but the tour of the same name is set to be one of the biggest ever.

According to an article in the Huffington Post, Madonna has taken in $50 million over the first three weeks of the tour and has seventy more shows to go. That projects out to a potential $450 million tour.

A concert promoter told HuffPosts "Naughty But Nice Rob", telling him "This is one of the biggest tours we have seen ... ever. She is playing some of the biggest venues around the world and selling them out."