Ketty Lester (born Revoyda Frierson; August 16, 1934) is an American singer and actress. She is best known for her 1962 hit single "Love Letters". The song reached the top 5 of the charts in the U.S. and the UK. She is also known for her role as Hester-Sue Terhune in the television series "Little House on the Prairie" (1977–1983).