Bellon studied psychology at the Sorbonne before abandoning her studies and turning to photography. She began her photographic career at René Zuber’s studio and later joined Alliance-Photo, founded in 1934. Fascinated by Surrealism, she documented its major exhibitions in Paris, including the International Exhibitions of Surrealism of 1938, 1947, 1949 and 1965. She also photographed many of its leading artists, including Marcel Duchamp, Joan Miró, Yves Tanguy and Salvador Dalí, leaving an important visual record of the movement and its exhibitions.