Born in Denmark, she came to Paris at 18. She met Coco Chanel and Pierre Cardin and started as a top model. She met Jean-Luc Godard about a cameo in Breathless (1960), but she had to be naked and she refused to play in the movie. One year later, they wed and she became famous with the "Nouvelle Vague" movies directed by him, Jacques Rivette, and Agnès Varda.

In 1967, Serge Gainsbourg wrote his only film musical Anna (1967) for her, with the hit "Sous le soleil exactement". Then, she went to Hollywood for a few movies and came back to Paris. She wrote and directed Vivre ensemble (1973) after her divorce from Pierre Fabre. She later remarried, to Dennis Berry.