The 42-year-old actress, who made her debut at Cannes in 2002, said her journey has been humbling and beautiful.
"It is an absolute privilege to represent L'Oreal Paris and India in particular, at a platform that honours world cinema and beauty in equal measure.
"15 years with Cannes have gone by in a flash and the journey has been immensely humbling and beautiful. I've treasured every moment at Cannes and I'm ever so thankful to L'Oreal Paris, members of the Indian and World media, my well-wishers and my family for always making this such a memorable experience. I'm looking forward to now creating some Infallible moments at the French Riviera with my L'Oreal family of amazing make up technicians and my co-ambassadors," she said in a statement.