Sienna Miller didn't wait long after her split with Welsh guy Rhys Ifans to take up with a new secret love, she currently rumored to be boinking handsome actor and oil heir Balthazar Getty, a married father of four, the youngest born just last October.
A source told The News of the World that they are trying to keep their affair quiet...except we are talking about Sienna Miller here so you know it's not going to be quiet.
A source said, "They daren't go out together, so they spend most of their time inside. When they do leave, they go separately."
The Sun reports: “Sienna has known Balthazar for a while and they’ve spent more time together over the last four months. They became closer after spending time dining with friends at the Chateau Marmont in March and April. When Sienna realized she had feelings for Balthazar, she ended her relationship with Rhys over the phone. She wanted to do the right thing before things really happened between her and Balthazar.”
Balty's wife Rosetta apparently left their home in Los Angeles, taking their kids with her, after she heard about his affair with Sienna. The "Brothers and Sisters" actor, who also appeared in Alias, Ladder 49, and White Squall, has stayed out of the scandal rags unlike his famous family although Balty has battled heroin addiction.
His father, J. Paul Getty III, was on vacation in 1973 when he was kidnapped by the Italian mafia. It turned out to be one of the most famous kidnappings in history when his family balked at paying the $3.4 million dollar ransom demanded, so the gangsters cut off his right ear and mailed it to a newspaper.
Finally the tightwad grandfather, the billionaire oil tycoon J Paul Getty, sent $1 million and J. Paul III was released. Paul III went on to have scandalous problems with alcohol and drug abuse that resulted in paralysis and blindness.
The late J Paul Getty (Balty's great grandfather) was one of the richest men in the world. Getty Oil was eventually acquired by Texaco in 1984
Other notches on Sienna's bedpost include P Diddy (while his girlfriend was expecting the twins), Rhys Ifans, Jude Law, and Daniel Craig.


