During her senior year at Eric Hamber High School in Vancouver her teacher encouraged her to attend an open casting audition for a new show, Edgemont. It was an audition she was sure would be pointless, but it would at the very least give her something to do. When she left Eric Hamber High School in 2000, she was already well on her way to stardom, having been snapped up by the eagle-eyed casting directors, who had spotted her star quality, and cast her in the lead role, as Laurel. She has since starred in two seasons of the hit series as the witty, artistic 16 year-old from Toronto, who has trouble dealing with her new suburban surroundings.

In 2001 Kristin landed the title role in the ABC movie Snow White, co-staring with Miranda Richardson. This film was recently premiered in the US under the name of "Snow White: The Fairest of Them All."

In the spring of 2001, she met the casting director for a new series that the Warner Bros Television Network was working on called Smallville. The new series was about a young Clark Kent, and his secret love for Lana Lang. Kristin was initially skeptical after hearing the premise, as she felt that the character of Lana sounded far too boring, and would have little or nothing going for her. However she went to Los Angeles for a meeting with the producers, and on reading the script, changed her mind. When offered the role, she immediately accepted.

Kristin has recently been chosen as the new face of the Neutrogena skin-care range, appearing in ads on television, and in magazines. She follows in the footsteps of Jennifer Love Hewitt and Mandy Moore, in promoting these products. Interesting side note - Kristin's parents did not allow her to wear make up and because of this she does not feel the need to wear makeup to this day. She is exactly what Neutrogena wanted - a natural beauty.