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Sienna Miller looked incredible as she slipped into a busty satin gown for the Ambassador Theatre Group Summer Party on Monday at Kensington Palace.
The actress, 39, went braless in a plunging blush dress, which teased a glimpse of her cleavage and showcased her enviable frame.
The dress boasted spaghetti straps and featured an elegant full skirt.
Glow: Sienna Miller looked incredible as she slipped into a busty satin gown for the Ambassador Theatre Group Summer Party on Monday at Kensington Palace
Sienna wore her tresses in soft waves and sported a radiant palette of make-up for the evening.
The American Woman star hosted the event alongside ATG CEO Mark Cornell in support of Sir Sam Mendes and his Theatre Artists Fund.
Sienna has been busy lately filming a mystery TV series in New York.
