Who was the first Indian actress to model for Lux soap?

Leela Chitnis was indeed the first Indian actress to become a brand ambassador for Lux soap in the early 1940s, breaking new ground for Indian actresses in advertising. This was during the colonial era when Indian representation in major brand advertising was rare. Later stars like Aishwarya Rai became Lux ambassadors much later in the 1990s-2000s.