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| Rocco Ritchie and Madonna on stage in Philadelphia |
Madonna's son Rocco Ritchie lad who's not embrassed to rock out with his mum.
The 12-year-old — whose dad is movie director Guy — joined her on stage in front of 20,000 fans in Philadelphia as she kicked off her US tour.Madge, 53, wore a see-through corset at one point.
We bet Rocco nipped backstage for that bit.
