Sienna roamed the streets of London with her man Rhys, but given her killer tan [1] and sexy white dress, it looked more like she was in sunny California. Check out the cutout in the back [2]! Sienna's usually more disheveled in jeans [3], but seeing her in a mini dress reminds me of how womanly she can be if she tries. In true Sienna fashion, she toned down the sexiness of her dress by wearing Roman sandals and a cool, green clutch.

[3]
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Logo Dolman Sleeve Dress [3]Logo Dolman Sleeve Dress [3] by Bebe [3] $69.00
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Muzina Cracker in White [3]Muzina Cracker in White [3] $90.00 at Revolve Clothing [3]
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Rachel Leigh Gold Plated Knot Bangle Bracelet [3]Gold Plated Knot Bangle Bracelet [3] by Rachel Leigh [3] $32.00 at Tobi [3]
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F4287 Sunglasses [3]F4287 Sunglasses [3] by Forever 21 [3] $5.80
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Marc Jacobs Day Flo Clutch [3]Day Flo Clutch [3] by Marc Jacobs [3] $295.00 at Barneys New York [3]
Bauer-Griffin Online [4]