Margarita Sierra

Margarita Sierra , born as Maria Margarita Suarez Sierra in Madrid, Spain, was a singer, dancer, and actress perhaps best known for her supporting role as the nightclubsinging Cha Cha OBrien on the early 1960s ABCWarner Brothers television series, Surfside 6, with Troy Donahue, Van Williams, Lee Patterson, and Diane McBain.

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Source: Wikipedia