Kiki Dee

Pauline Matthews (born 6 March 1947), better known by her stage name Kiki Dee, is an English singer. She is best known for her 1976 duet with Elton John, entitled "Don't Go Breaking My Heart", which went to Number 1 both in the UK Singles Chart and the US Billboard Hot 100 chart. In 1993 she performed another duet with Elton John for his Duets album, a cover version of Cole Porter's "True Love", which reached No. 2 in the UK.

source: Wikipedia