Sienna Miller Stuns On Vacation In St.Tropez With Boyfriend

Sienna Miller has an age-defying figure.

The 37-year-old actress is in St. Tropez with her fairly new boyfriend, Lucas Zwirner, and looks stunning.

Miller and her beau, who owns an art gallery, look like they are having a blast in the crystal blue water at the popular celebrity getaway.

Miller was sporting a very sexy black one-pice that showed off her flawless figure. Her boyfriend Lucas wore some basic drawstring blue trunks.

The good looking couple went public with their romance in January after being introduced through mutual friends in New York.

The happy couple spent some time with friends while taking a dip in and out of the ocean.

Hanging out on the dock, the group could be seen exchanging laughs while taking in the unreal sights.

While it's not known exactly when Sienna and Lucas began dating, he was the star's +1 when she attended her ex fiancé, Tom Sturridge's, birthday party.

Sienna and Tom co-parent 6-year-old daughter, Marlowe, and have remained on great terms since their split over three years ago.

Last year, Sienna told Harper's Bazaar magazine that Tom was her, "best friend in the entire world," and that even though they don't share a property, they often stay together to spend mutual time with their little girl.

Miller admits that their close bond has not broken since they cut romantic ties in the summer of 2015 after four years together, and said, "We still love each other."

"I think in a break-up somebody has to be a little bit cruel in order for it to be traditional, but it’s not been acrimonious in a way where you would choose to not be around that person," she explained.

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