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. 

Shimmer: The actress, 39, went braless in a plunging blush dress, which teased a glimpse of her cleavage and showcased her enviable frame

 While Sienna's latest project is currently under wraps, she was last known to be filming for Netflix's new political drama Anatomy Of A Scandal. 

The show is based on the acclaimed 2018 bestseller by former political journalist Sarah Vaughan. 

Sienna is set to star in the film as the wife of a shamed minister played by Rupert Friend.

Wow: The American Woman star hosted the event alongside ATG CEO Mark Cornell in support of Sir Sam Mendes and his Theatre Artists Fund (pictured)

The plot of the movie follows the trial of the Eton-educated politician after he's accused of sexually assaulting a young political aide.   

The serious plot revolves around James Whitehouse's rape accusation filed by an aide with whom he'd been having an affair.

The role of the aide, called Olivia, will be played by the Charlie Angels actress Naomi Scott, it was confirmed in December.

The cast of the six-part series, which Netflix describes as 'an insightful and suspenseful series about sexual consent and privilege', also includes Downton Abbey actress Michelle Dockery as the high-flying prosecutor.

Sophie (Sienna) is convinced that he is innocent and will do whatever it takes to protect her family in the wake of the scandal.

Meanwhile, criminal barrister Kate (Michelle) is equally convinced that James is guilty and is determined to see he pays for his crimes.

Radiant: Sienna wore her tresses in soft waves and sported a radiant palette of make-up for the evening

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