Sienna Miller is dating a man known as Slinky Wizard.

The "G.I. Joe: The Rise of Cobra" star has been seen enjoying intimate dates with George Barker, a "psychedelic trance" DJ who insists his friends call him by his magical moniker.

The 27-year-old actress met George earlier this year and took him to the Secret Garden Party music festival last month.

Since then, they have been meeting in secret and are reportedly busy planning their first holiday together.

A source told Britain's Daily Mirror newspaper: "Sienna and George is still a pretty casual, low-rent thing but they're both really happy."

"George is a good, all-round guy and they have friends in common. He's not famous and isn't interested in fame."

"George is really into his music and has been introducing Sienna to new stuff, and has even given her a go on his decks."

"They've talked about a holiday together and Ibiza has been discussed. It's early days but things are looking great."

Sienna has had a string of unsuccessful relationships.

Her engagement to Jude Law broke down when it emerged he had been having an affair with his children's nanny.

She attracted widespread criticism in 2008 when she embarked upon a romance with US actor Balthazar Getty, who was married with children at the time.

Source: BANG Showbiz