When high street favourite M&S announced their collaboration with actress and style icon Sienna Miller as brand ambassador last autumn, we had a feeling this would be the partnership to make M&S 'cool' again and we were right! If we didn't think M&S could pull at our pruse things any more this time the style icon is back just in time for the party season with another limited edition collection that is set to be another sell-out. Get your dancing shoes ready and prepare to embrace your inner