Another leading man for Sienna

When Sienna Miller plays a movie love scene, she gives it all her heart.

So much so that she can't seem to let go afterwards.

Her ill-fated relationship with Jude Law began after they met on the set of Alfie.

And now she has been spotted canoodling with Star Wars actor Hayden Christensen, who plays her lover in the forthcoming movie Factory Girl.

Miss Miller, 24, is currently in Canada meeting Christensen's family.

The pair popped out to a shopping mall in the 24-year-old actor's Range Rover and, in between visiting stores, buying flowers and drinking coffee, found plenty of time for mouth-to-mouth contact.

They had not met before shooting began on Factory Girl, in which Miss Miller plays Edie Sedgwick, Andy Warhol's anorexic muse.

Christensen plays singer-songwriter Danny Quinn in the new movie, which is set in 1965 and portrays the outrageous goings on in Warhol's New York loft, which was known as The Factory.

He made his name playing Anakin Skywalker, the Jedi knight who turns into Darth Vader in Star Wars Episodes II and III.

A source close to Miss Miller said: 'Hayden was a brilliant shoulder for Sienna to cry on when she finally split from Jude Law. Sienna is quite flirty and their friendship became something more.

'Hayden is besotted with Sienna but I'm not so sure that she totally reciprocates his feelings.

'Ever since they stopped filming Factory Girl he has been calling and texting her - he thinks he is in love.'