Just days after Sienna Miller was romantically linked to a married American actor, photographs purporting to show the pair openly cavorting in public have emerged.

The three pictures on website DListed.com appear to show the British actress and Balthazar Getty, a father-of-four and heir to the Getty oil fortune, in a tender embrace.

They are said to have been taken by a member of the public in Prague, Czech Republic, one month ago - when Miss Miller was still dating her former boyfriend, actor Rhys Ifans.

Sienna Miller cuddles up to her rumoured love interest Balthazar Getty in Prague about a month ago - while she was still dating Rhys Ifans

Miss Miller's growing closeness to Mr Getty, 33, came to light this week after the pair were spotted meeting in secret around Hollywood.

News of an undercover romance was first reported in Sunday's News of the World.

The 26-year-old Alfie actress and Mr Getty, a multi-millionaire, have been spending increasing amounts of time together.

She reportedly flew to Los Angeles at the beginning of last week following the breakdown of her nine-month-old relationship to 39-year-old Notting Hill star Ifans.

Miss Miller, once engaged to Jude Law, was then spotted at a petrol station with Getty last Tuesday.

Bonding: Balthazar and Sienna share an intimate moment

On Thursday it is said they met for dinner at an Italian restaurant in Beverly Hills. The day after they were seen at the Chateau Marmont Hotel, the place where they first met in LA.

Miss Miller's ex-boyfriend Matthew Rhys, who co-stars with Getty in U.S. TV drama Brothers and Sisters, introduced the pair last summer.

Mr Getty last night denied he is romantically involved with the actress and dismissed reports he and his wife are to divorce.

He said: 'It's not true. No truth, no truth to any of that.'

Tender: He lovingly touches her face

Getty previously dated actresses Drew Barrymore and Milla Jovovich. He married clothes designer Rosetta Millington in 2000. Their children are Cassius, seven, Grace, six, Violet, five, and eight-month old June Catherine.

Rosetta is understood to have flown to Italy with their children after the revelations emerged.

The actor's great-grandfather was the late Jean Paul Getty, founder of the Getty Oil Company. His father is John Paul Getty III.

In happier times: Former couple Rhys Ifans and Sienna in February

Getty and his wife Rosetta, the mother of his four children, in January. Rosetta is understood to have flown to Italy following the revelations