Aishwarya, who completed her 15 years at Cannes this year, had drawn flak on Twitter for wearing a purple lipcolour at the red carpet.
When asked what she felt about Aishwarya's purple lips outing and the flak it received, Sonam, who is also a brand ambassador of L'Oreal, said the "Sarbjit" actress should be happy with the attention she got.
"The whole idea of fashion and make-up is for people to discuss it and I guess she wanted to be discussed. She achieved what she wanted to achieve with it, which I think is great," Sonam told PTI.
"I think it (purple lipcolour) looked great and she carried it off with aplomb."
When asked if she would ever try a shade like that, the "Neerja" star said, "I have done purple lipstick in the past, I have even done black for a shoot... People haven't spoken about me!"
One of Sonam's red carpet appearance at the coveted festival, a saree-inspired long white gown, was also poked fun at.
Unfazed by it, Sonam, who found the gown her best outfit, said, "There were just one or two people (who cracked jokes on the dress) but I think it was my most incredible look. I don't believe in taking anything personally. I dress for myself and I felt beautiful."
"They (Michael and Tamara) are very good friends of mine. I spent New Years with them. I wanted to do something Indian-inspired and they kind of love India and love me. That's why I did jhumkas and a saree-gown, which I think was incredible."
While fashion critics and young women keep a close eye on stars' red carpet outfits at Cannes, for Sonam, the festival is about broadening her horizon as an actor by meeting international artists.
"Meeting people across the world always broadens your horizon. Being a part of Indian film industry is like you are living in a cucoon. You don't feel like there's more to life than that.
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