Varna International Ballet Competition
Osta joined the Paris Opera Ballet in 1988. In 1994, she won third prize at the Varna International Ballet Competition. In 2002, at age 32, Osta was named "étoile" after a performance of "Paquita". Choreographers she had worked with include Rudolf Nureyev, Carolyn Carlson, John Neumeier, Jiří Kylián, Jerome Robbins, Roland Petit, Mats Ek and William Forsythe. Osta retired from the Paris Opera Ballet in 2012, following a performance of "Manon".