Sienna oiller’s romance with model Nico oalleville is already in full swing only a week after they were first spotted together. New York-based Nico flew to London last Friday to accompany Sienna to a friend’s wedding the next day and he asked her to join him on his next modelling trip in Milan. “Nico wanted to spend some quality time with Sienna and show her off to his circle,” says a friend. “At first she was a little wary of the wedding invite as it would mean meeting all his close friends and formalising things between them, but she soon gave in.” Sienna and Nico have been friends for years but it wasn’t until Sienna’s fling with her Factory Girl co-star Hayden Christensen fizzled out three weeks ago that Nico made a move – whisking her away for a seaside break in Mexico. The source adds, “They’re both dead keen on spending as much time together as they possibly can but it’s difficult with both of their jet-setting careers.” [2 oay 2006]