Jamie (full name: James) is also a good friend of Nikki and Jason. You can see it in the Showgirl: Behind the scenes documentary and in recent clubbing pics.
Jamies, as many others on this tour, wasn't a newbie for Kylie, he has danced on all her promos for Slow and Red Blooded Woman. But he also had many other projections:

Goldfrapp, Dannii Minogue, Girls Aloud, Sarah Jorge, Charlotte Church, Crazy Frog, Jamelia, Emma Bunton

Last year he had many projections with Nikki (Kylie of course, Crazy Frog, Stars In Their Eyes)

FIGURES AND SKILLS
Hair: Brown
Eyes: Brown
Height: 5'10" - 178cm
Shoes: 8 (42)
Other Categories: Model
Skills:Freestyling, Roller Skating, Acrobatics, Juggling, Swimming, Ballroom & Latin Dancing