Thandie Newton has developed an odd friendship with Madonna - the two mums meet at their children's martial arts classes.Newton, who stars in RocknRolla - the latest movie by Madonna's director husband Guy Ritchie - admits she was turned onto the kids classes by the filmmaker, whose son Rocco is a regular.She says, "It turns out that his son Rocco goes to ju-jitsu just around the corner. I started taking (daughter) Ripley, and she just loves it."I met Madonna there - I went to watch Rip and she came to watch Rocco."It was really nice - two moms watching their kids bust out moves on the mat."

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