Gillian Hills is an actress and singer who became popular in the 1960s and released songs in the Yé Yé style. Born in Cairo in 1944, Gillian starred in the British film Beat Girl (1960) and was signed to famed producer Eddie Barclay's record label, which she stayed with until 1964. You might recognise one of her songs, Zou Bisou Bisou, which was featured in Mad Men in the cringe-worthy scene where Megan sings it to Don Draper at his 40th birthday party.
Towards the end of her recording career Gillian starred in Blow Up alongside Jane Birkin (great film) and the popular French TV series Les Globes-Trotters (1967). She stopped acting in 1975 and now lives in England with her rock manager husband, Stewart Young. If you get a chance, check out her album Twistin' The Rock on Spotify - lots of great Yé Yé songs!
Source: Ye-Ye Girls of '60s French Pop