The exes reunite to spend time with son Ryder in N.Y.C. Plus: Paris, Reese & Vince, Posh & Becks and more

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JUST PEACHY

After telling Ellen DeGeneres that she will show some skin at the drop of a hat, Keira Knightley proves her point in a revealing peach Rodarte dress at the Los Angeles premiere of her film Atonement on Thursday.