premise: Kate Walsh was on a sitcom.
hypothesis: Kate Walsh (actress) . Her roles include Dr. Addison Montgomery on the ABC television dramas Grey 's Anatomy and Private Practice , Rebecca Wright on the short-lived NBC sitcom Bad Judge , and Olivia Baker on the Netflix drama series 13 Reasons Why . Kate Walsh ( born 17 June 1981 ) is an English television presenter and former licensing development manager who came to the public 's attention in March 2009 whilst appearing as a candidate in the fifth series of The Apprentice .