Kate Walsh was born in San Jose, CA and grew up there and in Tuscon, AZ. After attending the University of Arizona, Kate Walsh did regional theater before moving to Chicago and working at the Piven Theatre Workshop. She went on to star in TROLIUS AND CRESSIDA at Chicago Shakespeare Repertory, as well as starring in FLESH AND BLOOD, A PINTER LANDSCAPE, HAPPY BIRTHDAY, WANDA JUNE and BORN GUILTY, a production Kate Walsh also performed as a radio play for NPR. Kate Walsh later moved to New York, joining the comedy improv group Burn Manhattan and performing in Off-Broadway productions of FLIGHT COURIER and THE FOUR TWINS.

Perhaps best known for her recurring role as Drew Carey's girlfriend, 'Niki Fifer', on "The Drew Carey Show", Kate Walsh is an accomplished film, television and stage actress. In addition to playing the bawdy "Carol Nelson" on the HBO series, MIND OF THE MARRIED MAN, Walsh also had both a recurring role on "Norm", as Norm McDonald's love interest, and a supporting role in Brett Ratner's feature film Family Man, with Nicholas Cage, Tea Leoni and Jeremy Piven. Kate Walsh made her television debut in the NBC crime drama "Homicide", and guest starred as a Navy fighter pilot accused of murder on "Law and Order." Besides being a recurring player on "The Drew Carey Show," Kate Walsh also had a recurring role as a union lawyer on the crime drama "Turks." Additional credits include the pilots, "Traffic" and "Missing Links", as well as appearing in numerous comedy sketches on "Conan O'Brien."

The crime drama Normal Life marked her big-screen debut, with Kate Walsh playing the sister of bank robber Luke Perry. Kate Walsh played a girl who hooks up with the wrong man in Henry 2: Portrait of a Serial Killer, and starred as a kleptomaniac in Peppermills, which won Best Short Film at the Berlin Film Festival in 1998. In addition, Kate Walsh starred in the independent films The Below Zero, and the relationship drama Lawrence Melm.

• Legion (2010) (post-production) .... Sandra Anderson
• One Way to Valhalla (2009) (post-production) .... Raina
  
• "Private Practice" .... Dr. Addison Montgomery (30 episodes, 2007-2009)
       - What You Do for Love (2009) TV episode .... Dr. Addison Montgomery
       - Do the Right Thing (2009) TV episode .... Dr. Addison Montgomery
       - What Women Want (2009) TV episode .... Dr. Addison Montgomery
       - Finishing (2009) TV episode .... Dr. Addison Montgomery
       - Wait and See (2009) TV episode .... Dr. Addison Montgomery
        (25 more)
• "King of the Hill" .... Katt Savage (1 episode, 2009)
       - Uncool Customer (2009) TV episode (voice) .... Katt Savage
• "Grey's Anatomy" .... Dr. Addison Montgomery-Shepherd / ... (56 episodes, 2005-2009)
       - An Honest Mistake (2009) TV episode .... Dr. Addison Montgomery
       - Before and After (2009) TV episode .... Dr. Addison Montgomery
       - Piece of My Heart (2008) TV episode .... Dr. Addison Montgomery
       - Didn't We Almost Have It All? (2007) TV episode .... Dr. Addison Montgomery
       - Testing 1-2-3 (2007) TV episode .... Dr. Addison Montgomery
        (51 more)
• Upright Citizens Brigade: Asssscat (2008) (TV) .... Guest Monologist
• Girl Missing (2007) (V) (unconfirmed) .... Abbie Pennington
• Veritas, Prince of Truth (2006) .... Nemesii
  ... aka Veritas - El príncipe de la verdad (Mexico)
• Bewitched (2005) .... Sexy Waitress
• Inside Out (2005/I) .... Tyne
• Kicking & Screaming (2005) .... Barbara Weston
• "Eyes" .... Kendall Judd (1 episode, 2005)
       - Wings (2005) TV episode .... Kendall Judd
• Bobby Cannon (2005) (TV) .... London
• Wake Up, Ron Burgundy: The Lost Movie (2004) (V) .... Sue