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Mercedes Alicia McNab (born March 14, 1980 in Vancouver, British Columbia) is a Canadian-born actress perhaps best known for playing the role of Harmony Kendall on Buffy the Vampire Slayer and its spinoff Angel.

Mercedes McNab has been acting professionally since she was 10 years old. Born and raised in Vancouver, British Columbia, Canada, she moved with her parents to Los Angeles at age nine where she had a desire to become an actress and soon landed an agent.

Her first role, at age 10, is probably the one where she is most widely recognized for in a bit part as the young girl scout in the hit film, The Addams Family (1991). She even landed a similar role as Amanda in the sequel, Addams Family Values (1993). But the role she is most famous for is a recurring role in playing the dim-witted Harmony Kendall on "Buffy the Vampire Slayer" (1997) for four years, and later its spin-off "Angel" (1999) in a guest spot in 2001 and later as a regular for its final season from 2003-2004.

Some of her television appearances include the unaired Fox television pilot for "Buffy the Vampire Slayer" (1997), and appearances in "Harry and the Hendersons" (1991), "Touched by an Angel" (1994) and "Walker, Texas Ranger" (1993).