Sylvie Vartan (born 15 August 1944) is a Bulgarian-French singer. She is known as one of the most productive and tough-sounding yé-yé artists. Her performances often featured elaborate show-dance choreography, and she made many appearances on French and Italian TV. Yearly shows with then-husband Johnny Hallyday attracted full houses at the Olympia and the Palais des congrès de Paris throughout the 1960s and mid-1970s. In 2004, after a break in performances, she began recording and giving concerts of jazz ballads in francophone countries.