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Her ex Jude Law married his girlfriend Phillipa Coan in a surprise wedding ceremony in London.
And Sienna Miller didn't seem too bothered as she hailed a taxi in New York City on Thursday.
Actress - Figure - Skirt - Kitten - Heels
The actress, 37, cut a typically stylish figure in a side-split black skirt and yellow kitten heels as she continued on about her day.
Sienna added to the pretty look with a simple white top and a pair of black RayBan sunglasses.
Blonde - Locks - Features - Coat - Make-up
She kept her blonde locks loose and flowing, while her stunning features were enhanced with a simple coat of make-up.
Sienna's sighting comes after news emerged that her ex Jude got married to Phillipa at Marylebone Registry office.
Actor - Phillipa - Hollywood - Guest - List
The actor, 46, and Phillipa, 32, decided to shun a Hollywood guest list and invited only their closest friends and family to the nuptials.
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