The 27-year-old will be at Cannes as brand ambassador of beauty brand L'Oreal Paris which completes 16 years as the official make-up artist for the film fest.
"On my way to the Cannes Film Festival. Really excited to walk the red carpet," Sonam tweeted.
The film festival will begin May 15 and conclude May 26. Other Bollywood stars like Amitabh Bachchan and Aishwarya Rai will also be present there.