Kate Hewlett (born December 17, 1976 in Toronto, Ontario) is a Canadian actress, writer and songwriter. Her older brother is British-born Canadian actor David Hewlett, who portrays Meredith Rodney McKay in Stargate: Atlantis. Kate guest-starred as McKay's sister Jeannie in four episodes of the show. She also co-starred with him in the 2006 film A Dog's Breakfast and also appeared in his third directional movie, "Debug" which was released in David Hewlett's native United Kingdom on November 3rd 2014.