The rampant movie beauty has been enjoying ROMANTIC NIGHTS with tycoon actor and dad-of-four Balthazar Getty after dumping heartbroken Notting Hill star Rhys Ifans earlier this month.
The besotted pair have been holed up together day and night in Hollywood after his heartbroken wife fled the country with their kids.

Despite playing a cat and mouse game to stay out of the headlines they have been spotted secretly meeting at restaurants near their hillside hideaway.

A source revealed: "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."

In one rendezvous on Thursday, 26-year-old Sienna drove to a restaurant while former heroin addict Getty, 33, even CYCLED there to try to avoid being spotted with her. Now Getty's clothes designer wife Rosetta has RUN AWAY to Italy with their four children —the youngest born only eight months ago—after RUMBLING her wandering husband.



He is heir to the oil fortune of his great-grandfather Jean Paul's, once one of the richest men in the world.
And pals say lovestruck Sienna has even 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.

Matthew, 33—who stars with Getty in the hit US sitcom Brothers And Sister—introduced the milionaire hunk to Sienna last summer—ironically at the Chateau Marmont hotel where they are snapped together in our exclusive pictures today. Our source told us: "Sienna got to know Balthazar through Matthew and they hit it off. In the past three months they have grown incredibly close.

"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.

"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."

Sienna flew to Los Angeles last MONDAY after finishing her nine-month stormy relationship with Welsh star Ifans. She was rumoured to have jumped back into Matthew's arms earlier this month after the premier of The Edge Of Love in which she plays his screen wife.

But it was just a ploy to put people off the scent. Our 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.

"Now Matthew feels a bit of an idiot—his friend and co-star Balthazar has nicked his old love. He's angry he's been caught up in the whole mess."

The couple were first spotted together last TUESDAY at a Hollywood petrol station. She pulled up to the pumps but baffled other garage users by staying in the car.

Suddenly Getty jumped out of a parked black SUV and walked over and filled up her black Lexus for her before jumping back into his motor.

Then they both drove off. An onlooker told us: "What they did was so bizarre. She kept looking around all the time as if she was worried someone was looking. He was already in his car waiting when she arrived. When he'd filled her up he went to the window and called her ‘honey' as he leaned into the car to talk to her."

Then on WEDNESDAY Sienna was seen ordering a takeaway at a Hollywood Mexican restaurant before driving back to their hideaway house where Getty's black SUV was parked in the drive. On THURSDAY they met for dinner at a Beverly Hills Italian restaurant. Fellow diners saw Getty arrive first on a racing bike before Sienna turned up in her car.

"She came in with a hat pulled down over her eyes. She obviously didn't want to be recognised," said an onlooker. "When they left they went out separately too, with Sienna carrying the rest of her pizza in a box. Then he came out and jumped on his bike. "It was obvious these two didn't want to be seen together."

On FRIDAY they went back to where they first met—LA's Chateau Marmont hotel—where they were later joined by Angelina Jolie's ex-hubby Jonny Lee Miller and several other friends. Wearing a baggy grey cardigan, striped cream shorts and patent ankle boots, Sienna sipped on white wine as she waited for Getty to join them.

At midnight she smiled happily as Getty strolled on to the hotel's candlelit terrace and joined them.

Getty pecked his new love on the cheek before sitting down beside her. A witness said: "There was no escaping that they were together and everybody else at the table knew they were too. As soon as Balthazar walked in, everybody moved round so he could be next to Sienna. And they'd deliberately picked a table next to a hedge to try to hide as much as they could."

At one point Getty—whose first big film role was in 1990 movie Lord Of The Flies—stroked her cheek and held her face in his hands as the group chatted until the early hours. They went back to their hideaway in separate cars.

Of the two, the fallout of their secret love has more repercussions for Getty, who beat a seven-year addiction to heroin.

Until meeting Sienna, the oil heir—who has BZAR tattooed on the fingers of his right hand—seemed happily married to clothes designer Rosetta Millington whom he wed in 2000. Together the couple shared their Hollywood hilltop mansion with their four children—son Cassius, seven, and daughters Grace, six, Violet, five, and eight-month-old baby June Catherine. He once said: "Family is really important to me."

But Getty tried to cover last month's visit to Sienna in Prague—where she is filming her new movie GI Joe—by saying he was visiting his SICK MUM in Germany.

Two weeks ago Rosetta, 32, found out. "She was utterly devastated," said our source. "Now she has gone to Italy to have time to come to terms with her family falling apart.

"She is furious with Sienna, but even madder with her husband. She can't believe he could throw away all they shared over some young blonde." News of Sienna's latest love is sure to cause further distress to Ifans, who has been inconsolable since she finished him. They were planning to marry this summer. Sienna got together with him after ditching Matthew Rhys following their romance while filming The Edge Of Love which opened on Friday.

But in March, Ifans suspected Sienna had rekindled her romance with her ex after they were seen partying in LA.

In recent weeks Ifans has been photographed looking increasingly bedraggled, going on pub crawl after pub crawl as he battles to cope with the break-up.

Sienna's relationship with Ifans was her first serious romance since her engagement to actor Jude Law ended in 2005 after he admitted cheating on her with his nanny.

At the same time the News of the World revealed how the beauty had also had an affair with Bond star Daniel Craig.

Now she's Sienna a new man—and as usual where her love life is concerned, things are very complicated.