Sienna Miller, 41, wears tiny bikini during vacation in St. Tropez with boyfriend Oli Green, 26

Sienna Miller was spotted enjoying a day in the sun while on vacation with her 26-year-old boyfriend, Oli Green.

The “American Sniper” actress, 41, was seen taking a swim and then climbing onto a sporty boat in the middle of the ocean in St. Tropez on Tuesday.

At one point, the mom of one even got behind the wheel and steered the small luxury boat.

She wore a tiny colorful striped bikini for the fun day of water sports.

Also joining Miller and her boyfriend on the trip was her 10-year-old daughter, Marlowe, whom she shares with actor Tom Sturridge.

The pre-teen wore a pink bikini and was pictured climbing onto the boat before her mom.

Green and Miller first sparked dating rumors last March when Page Six exclusively obtained photos of the pair kissing and getting touchy-feely at dinner at Le Bilboquet.

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The pair was spotted enjoying a date night at a New York Knicks game in March — just weeks after the “Layer Cake” star locked lips with Cara Delevingne at a bar in NYC.

An onlooker described the two actresses as “fluid friends” after the January 2022 outing, saying, “Sienna made out with this tall guy, and then she made out with Cara. It was a fun night out.”

In the past, Miller has been romantically linked to businessman Archie Keswick, actor Jude Law, art gallerist Lucas Zwirner and Sturridge, with whom she co-parents her daughter.

In April 2022, the “Alfie” star got candid about her decision to freeze her eggs.

She told Elle she felt “pressure” to have more kids in her 30s, adding that “biology is incredibly cruel on women in that decade.”

Miller explained that she isn’t “really focused” on having another baby, but “if it happens, it happens.”

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