In 1987, she enrolled in Paris Opera Ballet School, at the encouragement of Roland Petit, and trained there for a year.

[2] In 2002, at age 32, Osta was named étoile after a performance of Paquita.

[1] Choreographers she had worked with include Rudolf Nureyev, Carolyn Carlson, John Neumeier, Jiří Kylián, Jerome Robbins, Roland Petit, Mats Ek and William Forsythe.

[3] Osta retired from the Paris Opera Ballet in 2012, following a performance of Manon.

[4] Osta became the director of choreographic studies at Conservatoire de Paris in 2013,[5] then ran the L’Atelier d’Art Chorégraphique between 2015 and 2017.