Chloe Bruce. She's pretty famous in Europe for her karate skills.
Heh, I remember watching vhs tapes of Jean Frenette doing the same thing in the early 90s. He used to do a bunch of shows and competitions like that. Now he's a really well know stunt coordinator for movies.
http://www.youtube.com/watch?feature=player_detailpage&v=U4AnDv6cVmA#t=157s
I love the fact that he comes in the arena sitting on a bike driven by an eye-patch wearing biker. He does his show and then jump back on the back and basically says "See ya suckers" and rides out hahaha.