In the ad, Lara will be seen in a Gavin Miguel designed full-length gown made of lettuce leaves and other vegetables. It was shot by ace fashion photographer Jatin Kampani.
"Even seemingly small choices can have a big impact on our health, our community and the world around us. Going vegetarian is one of the easiest ways to improve our health, help countless animals and protect the Earth, " Lara said in a statement.
People who follow a plant-based diet have lower rates of heart disease, strokes, cancer, diabetes and obesity than meat-eaters.
Some of the other vegetarian celebrities include Shahid Kapoor, Kareena Kapoor, Mahima Chaudhary, R. Madhavan, Rajneesh Duggal and Aditi Govitrikar.