British star Sienna Miller is sparking rumors that she is allegedly dating married actor Balthazar Getty after only just weeks after splitting with boyfriend Rhys Ifans.The Hollywood actress parted ways with the Welsh actor earlier this month, amid rumors he was becoming too possessive of her. But the actress appears to have moved on from the split, after being photographed out and about in Hollywood this week with the 33-year-old oil heir-turned-actor. Miller has said to have been introduced to the 33-year-old through her Edge Of Love co-star and Getty’s Brothers and Sisters castmate Matthew Rhys. A source tells British newspaper News Of The World, "They went to great pains to find a place where they thought nobody would find them. They daren’t go out together, so they spend most of their time inside. When they do leave, they go separately." Meanwhile, Getty’s fashion designer wife Rosetta Millington has fled the U.S., taking their four children - the youngest born just eight months ago - to Italy, according to British newspaper The News of the World.