Sienna Miller and Balthazar Getty enjoyed a romantic holiday in Italy at the weekend.

The 'Factory Girl' actress — who recently split from 'Notting Hill' actor Rhys Ifans — kissed and cuddled the 33-year-old married actor on a yacht with friends on the Amalfi coast.

Although the father of four — the heir to the Getty family's oil fortune — recently denied the romance, the pair seemed happy to flaunt their new relationship and posed for photographs.

An onlooker said: "Sienna was literally beaming. She seemed completely at ease, very relaxed and very happy. Balthazar had his arm around her most of the time, and they didn't leave each other alone throughout the yacht trip."

Getty — who has previously dated actresses Drew Barrymore and Milla Jovovich — and 26-year-old Miller were first introduced by Welsh actor Matthew Rhys, who co-stars with Getty in hit US TV show 'Brothers and Sisters'.

Miller briefly dated Rhys last year, and her closeness to her 'Edge of Love' co-star is said to have been a factor in her split from Rhys last month.

Miller and Getty have also been spotted at Los Angeles' Chateau Marmont Hotel enjoying intimate dinners together.

Following reports of the romance, Getty's wife, Rosetta Millington, allegedly flew to Italy with the couple's four children — Cassius, seven, Grace, six, Violet, five, and eight-month-old June Catherine — to confront the actor.