British actress Sienna Miller has fuelled rumours she is having an affair with married Balthazar Getty - after they were photographed together in a topless clinch. The pair was snapped frolicking on a yacht off Italy's Amalfi coast earlier this week (beg07Jul08), just days after actor Getty denied being romantically involved with the Alfie star. Miller is pictured embracing Getty wearing only skimpy bikini bottoms. A source tells British newspaper the Daily Mirror, "Sienna is totally besotted with Balthazar. Their relationship has gone from strength to strength over the past month and Sienna finds him utterly irresistible. "Balthazar arranged the trip to one of the most beautiful and exclusive parts of the Mediterranean. Sienna is telling all of her inner circle she's never been so in love." The romantic sunshine break comes less than six weeks after Miller split from Welsh actor Rhys Ifans. Getty, from Los Angeles, is married to Rosetta Millington and the couple has four children.