She represented the Albigeois-Midi-Pyrénées, a southwest region of France, and became the first winner of the Miss France beauty pageant to have dual citizenship, French and American.
Mortaud represented France at the Miss Universe 2009 pageant and finished in 6th place overall barely missing the top 5 by a mere one-fifth of a point (0.219) This pageant was won by Venezuelan Stefanía Fernández.
Mortaud became a finalist at Miss World 2009 (3rd runner-up) finals on December 12, 2009. She also placed 3rd runner up at the Miss World Beach Beauty competition and placed among the top 12 in the Miss World Top Model competition.
Out of seven delegates who competed at Miss Universe 2009 and Miss World 2009, only Chloé and Miss South Africa Tatum Keshwar made the finals in both pageants.