Sienna Miller enjoyed soaking up the sun in the company of her new boyfriend, Oli Green, as they enjoyed a romantic getaway in St Tropez on Thursday, July 21. The New York-born actress enjoyed her not-so-quiet holiday in the south of France with her 15 years younger boyfriend. Sienna and Oli stayed at the famous 5-star Hotel du Cap-Eden-Roc. G.I. Joe: The Rise of Cobra actress showed off her incredible figure in a tiny brown bikini as she enjoyed the sun. The beautiful actress was without make-up, showing off her age-defying beauty. She tied her blond hair in a bun and a little later untied it before entering the water to cool off. During the heat wave in Europe, Sienna, after relaxing on a sun lounger, went to the sea with her boyfriend for a fun ride on a towable inflatable boat where they had to wear life vests. The Anatomy of a Scandal actress wore a long gold necklace, a string of hoop earrings, and a small ring as she enjoyed spending time with her boyfriend. The Burberry model Oli Green wore bright blue shorts during their fun day in the sun.