Marie Ruggeri (born Maria Christina Ruggeri, 21 July 1952 in Déifferdeng), professionally known as Mary Christy, is a Luxembourgian singer and actress. Ruggeri grew up in Mamer, where her father worked as an entrepreneur. In the 1960s she was a child singer in Luxembourg and Germany where she appeared under the pseudonyms Marie Tina and Marie Christina. In the early 1970s, she moved to Paris where she performed under the name Mary Christy, and participated in the rock opera La Révolution Franç ...