Sienna Miller has been photographed sunbathing topless on a Mexican beach with her new love model Jamie Burke.
The young pair were seen kissing and cuddling up during a holiday on the coast of Mexico, confirming rumours they are an item.
An onlooker said: "They were like a couple of love-struck teenagers."
Jamie, 21, is the son of a millionaire and has been romantically linked to Lindsay Lohan, Kate Moss and Courtney Love.
Sienna, 25, split from on-off lover Jude Law for
good late last year. Their relationship hit the rocks in 2005 when it
emerged Jude had been having an affair with his children's nanny.
While shooting 'Factory Girl', it was reported that Sienna was romancing her co-star Hayden Christensen.
In the film, in which Sienna plays artist Andy
Warhol's tragic muse Edie Sedgwick, the pair's sex scenes are so
realistic they sparked speculation Sienna and Hayden romped for real.
Sienna and Jamie were spotted kissing earlier
this month at the Gramercy Park Hotel in New York City. Neither party
has confirmed the relationship.