Sienna Miller displays her taut abs in a cut-out orange bikini as she enjoys a swim in St. Tropez

Sienna Miller Soaks Up the Sun in St. Tropez with Boyfriend Oli Green!

Sienna Miller, 40, spends time with her boyfriend Oli Green, 25, during romantic St Tropez getaway

Sienna Miller shows off her toned frame and sun-kissed glow in a skimpy white bikini