The actress is expected to walk the red carpet wearing her favourite London-based designer Ralph & Russo.
Sonam will also be talking about Indian cinema at the Cannes India Pavilion on 20th May.
Other Bollywood actors expected to walk the red carpet include Deepika Padukone, Aishwarya Rai Bachchan, Kangana Ranaut, Huma Qureshi, Diana Penty and Hina Khan. Watch this space!