It appears that the pressure of a world tour is putting strain on Madonna�s marriage to filmmaker Guy Ritchie.

The couple are reportedly at loggerheads over the disruption caused to their children�s schooling while Madge is on tour.

A source close to the family revealed that Madge �likes to have her children with her � otherwise she wouldn�t see much of them.

�They already have schools in London and Los Angeles which they float between.

�But in recent weeks they�ve been to New York and Miami too, and she wants to take them to other tour stops like Russia.

�Madonna thinks it�s good for her kids to be with Mom and see the world, but Guy disagrees. He�s more traditional and would prefer them to be at one school.

�It�s causing a lot of tension � and their friends and family are voicing their concerns too.�

Surely she can�t tour forever can she?

In other Madonna news, it has been announced that the Material Girl will be auctioning off some of her stage outfits in a charity auction.

The Jean Paul Gaultier outfits she is wearing on her current �Confessions� tour will all be sold to help raise money for AIDs victims in Africa.

An insider told the Star: �She�s thinking about doing it through eBay, or maybe an auction house in London.�

If you�re a fan best start saving those pennies�