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Kelly J. McCreary (born September 29, 1981) is an American actress, best known for her role on the ABC drama series Grey's Anatomy as Dr. Maggie Pierce, the half-sister of series protagonist Meredith Grey. She joined the series as a guest at the end of the tenth season, becoming a series regular in the eleventh season. She has reprised her role on the spin-off series Station 19. Wikipedia