Looking relaxed, the 40-year-old former Miss World debuted a thinner self in the off-shoulder gown which she teamed up with open hair.
The mother of one kept her look minimal by going easy on accessories and instead concentrating on make-up. She paired her mermaid-cut pattered gown with heavily lined eyes and red lips.
The 'Devdas' star, who is accompanied by her two-year-old daughter Aaradhya and mother Brinda Rai at the 67th Cannes Film Festival, missed her date on the red carpet last week due to the Air Traffic Control strike in France.
Aishwarya has been a regular at Cannes thanks to her stint as the L'Oreal Paris brand ambassador and her 13th appearance at the red carpet saw her joining beauties Amber Heard, Alessandra Ambrosio and Selita Ebanks.
The actress also did a special shoot with 'Slumdog Millionaire' star Frieda Pinto for the beauty brand at Cannes.
Aishwarya will walk the red carpet again tonight to showcase the L'Or Lumiere collection by L'Oreal Paris at Cannes.
Other Indian celebrities who graced this year's red carpet at Cannes include Sonam Kapoor, Freida Pinto, Uday Chopra and Mallika Sherawat.