Kate Walsh (Dr. Addison Montgomery)
Derek Shepherd’s estranged first wife and world-renowned neonatal surgeon, played by Kate Walsh, originally left the series after three seasons — but has made appearances here and there. Since 2012, the actress starred in the Grey’s Anatomy spinoff, Private Practice, The Perks of Being a Wallflower, 13 Reasons Why and more. She is also the founder of perfume brand Boyfriend.
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