Marlene Knaus (born in 1956) is a former model and the ex-wife of famous Austrian Formula One driver Niki Lauda. She was a lesser-known model before she started dating the three-time Formula One World Championship winner. They were the most talked-about couple of their time and regularly made headlines. She previously dated actor Curt Jürgens. Niki and Marlene married within a year of starting their relationship.