Johns PKI / Splash News

WHAT SHE WORE At the Hamptons International Film Festival, Sienna Miller debuted her post-baby body in a white Alessandra Rich gown that she styled with gold cuffs, a Charlotte Olympia lip bag and pastel Prada flats.

WHY WE LOVE IT She had a baby when? The new mom made her red carpet return in a slim column.
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Sienna Miller

Sienna Miller wore Alessandra Rich's column in the Hamptons