Born in San Diego, California, the middle child of a California real estate-developer father and hairstylist mother, Seymour started her modeling career working for local newspapers and department stores in her hometown at the age of 16.
In 1983, she was a finalist at the inaugural Elite Model Management Look of the Year modeling contest (now called Elite Model Look).
Sie formen Trends, inspirieren und setzen stilistische Spitzen für die kommende Saison.
Stone was born in the small Dutch town of Mierlo, to a Dutch mother — Kathryna Stone and an English father — Michael Stone.
In March 1991, and again in February 1993, Seymour posed for Playboy.
Salvatore Ferragamo's creative campaign for his fall/winter 2007/2008 collection featured Seymour and Claudia Schiffer, shot on location in Italy with Mario Testino.
Stone was one of the models chosen to be in one of the fourteen covers of V magazine September 2008 issue.