Stewart has worked as an actress and brand ambassador.

Stewart's American television work includes a leading role in Going to California, written by Scott Rosenberg and directed by Ted Demme, and appearing in one episode of Judd Apatow's series, "Undeclared."

Stewarts first film was James Tobacks, Black and White, which also starred Robert Downey, Jr., and Jared Leto. In 2011 Stewart starred in the movie Homecoming, written and directed by Sean Hackett.

Stewart has appeared on the covers for Tatler and German Vanity Fair, which Bryan Adams shot; and she has worked with fashion companies including Tommy Hilfiger,American Vogue,Luomo Vogue, Elle,Italian Vogue, Vanity Fair,MaxMara, Richard Tyler,Catherine Malandrino, underwear line Ultimo (in a 100,000 deal), Tatler, InStyle,House of Field,and Chrome Hearts.

She realized an early ambition, at age 19, when she launched her own fashion collection - Pinky Starfish.Known for its dresses made from French vintage fabrics, the range was sold in Tracey Ross, Lisa Kline and Barneys.She started her own clothing label, but it foundered because she couldn't get the supply chain to work.

On September 9, 2008 the Atlanta-based band, "Elevation", released the music video for its single, Razoreyes", starring Stewart, marking a first in her career.

Stewart posed nude in 2008 in the British society magazine Tatler, along with Peaches Geldof, daughter of the Boomtown Rats Bob Geldof, and Leah Wood, daughter of the Rolling Stones Ronnie Wood.The photographer was Canadian rocker and photographer Bryan Adams. Stewart had previously posed nude with a crucifix in Italian Vogue, dismaying the Vatican.

Stewart, who plays violin and the piano, was approached by a producer in 2005; and, after doing some studio test-runs, Stewart has since begun taking singing lessons. To date nothing has happened with her potential music career.

Stewart has had her own reality show called Living with Kimberly Stewart. The show is based on Stewart looking for 2 flatmates with 13 contestants fighting through challengers to win the key of the Stewart house in London.

Stewart participates in the charity "Dirty Hands Caravan", founded by actor Sean Penn,which encourages young people to stand up for the causes they feel most strongly about and to take action. Her work with them included the filming of a documentary which followed the charity in New Orleans.Featuring Stewart, the documentary was screened at film festivals around the world.

Another of Stewarts causes is the water charity Fresh 2o,which aims to raise awareness and much needed money for struggling communities in Third World countries that do not have access to clean drinking water. British actresses Keira Knightley and Lily Cole have been previously featured; Stewarts campaign was shot by photographer Candice, with Stewart under water

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