1969: Laura Valenzuela

Laura "Laurita" Valenzuela (born Rocío Espinosa on 18 February 1931, in Seville, Andalusia, Spain) is a Spanish television presenter of the 1950s and 1960s.
Before becoming known in Europe for hosting 1969 edition of the Eurovision Song Contest, she was a model and appeared in many publications around the world. She was one of the first faces that Spain saw on television Televisión Española made its debut in 1956.
Valenzuela has also acted in many films since the early 1950s up through the late 1960s. In 1971, when she married film director José Luis Dibildos and had her daughter, also presenter Lara Dibildos, she retired from public life, until she returned to TV in 1991 in the private channel Telecinco. Later on, she returned to TVE. She retired again in the 2000s when she started her fight against breast cancer. She is now healed but still remains retired, apart from occasional collaborations or interviews.

From: http://en.wikipedia.org/wiki/Laurita_Valenzuela

During the first and so far last ESC in Spain in 1969.