London, June 29 (ANI): After dumping actor Rhys Ifans earlier this month, Sienna Miller is secretly dating a married multi-millionaire oil heir, it has been revealed.

The Brit actress has been enjoying romantic nights with tycoon actor and dad-of-four Balthazar Getty.

Despite their efforts to stay out of the headlines, the couple has been spotted secretly meeting at restaurants near their hillside hideaway.

"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," News of the World quoted a source, as saying.

Now, Getty's clothes designer wife Rosetta has run away to Italy with their four children after learning about her husband's extra-marital affair.

"Getty even secretly flew to London and Prague to be with Sienna to get to know her even better. And she's spent this week in a Hollywood house with him," a source said.

"Even though Balthazar loves his wife and children he cannot stay away from her. But Rosetta found out about them and has now fled to Italy.

"She can't believe her husband could do this to her. The whole family now know and everybody is devastated," the source added.

According to pals, Miller used her ex-boyfriend and 'Edge Of Love' co-star Matthew Rhys as a smokescreen for their romance, trying to give the impression she might be back with him after her split from 39-year-old Ifans.

"Sienna got to know Balthazar through Matthew and they hit it off. In the past three months they have grown incredibly close," a source said.

"Sienna tried to fight her feelings for Getty because she didn't want to cause Rhys any more pain.

"The whole time both of them have encouraged rumours she had dumped Rhys for Matthew because they didn't want anybody to know the truth," the source added. (ANI)