EXCLUSIVE: Sex And The City alumna Kristin Davis has signed on to star in and executive produce Of Two Minds, a Lifetime original movie that deals with mental illness. Tammy Blanchard will star opposite Davis in the film, which chronicles the relationship between a woman (Davis) and her younger sister (Blanchard), who has schizophrenia. British director Jim O’Hanlon (The Deep) will direct from a script by Richard Friedenberg (The 19th Wife). Also producing the movie are Frank Konigsberg and Daniel Ostroff. Filming is slated to begin in mid-November in Los Angeles. Davis, repped by UTA and Mosaic, will next be seen in Journey 2: The Mysterious Island. ICM-repped Blanchard is currently seen in Moneyball.