Norton started life as a gymnast before becoming an actress.

Kerry had a small part on the American TV series, Sabrina the Teenage Witch in 1996. The episode, entitled "A Girl and Her Cat", saw Norton putting her years of gymnast training to the test. Norton played the part of Lulu, a very flexible gymnastic witch, who was engaged to Sabrina's second cousin.

She has made several guest appearances on Battlestar Galactica as paramedic Layne Ishay (with her real-life husband as Major Lee 'Apollo' Adama). Ishay saves Commander Adama's life when shot by Sharon "Boomer" Valerii. She was in the first three episodes of season 2, "Scattered", "Valley of Darkness" and "Fragged", and a later episode entitled "Downloaded". She also appeared in the season 3 episode "Taking a Break from All Your Worries", and the season 4 episodes "A Disquiet Follows My Soul", "No Exit", "Islanded in a Stream of Stars" and "Daybreak, Parts 1 and 2".

She also played the leading role of Anne Alstein in The Screwfly Solution. She played the part of Maxi Purvis in Bad Girls' third and fourth series and was a member of the original cast of the touring play Seven Deadly Sins Four Deadly Sinners.

She also appeared in a Fairy Liquid television advertisement in 2010.[citation needed]

In 2005 she recorded an album of covers, titled Young Heart. Track number three ("Everlasting Love") has also been used in a commercial for Grolsch Brewery.

Norton is married to English actor Jamie Bamber Griffith, and they have three daughters: Isla Elizabeth Angela Griffith, and twins Darcy and Ava. She has two sisters, Jackie and Lorraine and a brother named Matthew.