Spotted: The pair were photographed kissing, cuddling and enjoying a romantic holiday in Italy at the weekend. They have also been seen at Los Angeles' Chateau Marmont Hotel enjoying intimate dinners together.

Is it love? The father of four - the heir to the Getty family's oil fortune - recently denied the romance. However the pair seemed happy to flaunt their new relationship to the cameras. An onlooker said: "Sienna was literally beaming. Balthazar had his arm around her most of the time, and they didn't leave each other alone throughout the yacht trip."

Love rating: 4/10. 'The Factory Girl' actress only recently split from 'Notting Hill' actor Rhys Ifans, it maybe too much too soon.