Tops, trousers and accessories for 6-14 year olds will all get the Becks style treatment in the deal with the high street clothes store.
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"I want to help create the kind of clothes which I would have wanted to wear when I was younger," said the Man United and England star.
M&S say he's a "style icon and role model" and that's why they chose him.
But you'll have to wait till the clothes are in the shops in September to find out if there are any skirts in the range!
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