Sonam will take the place of Aishwarya, who had been associated Kalyan Jewellers for three years. Amitabh Bachchan and his wife Jaya continue to be the ambassadors for the leading jewellery chain.
Sonam, 30, will endorse the brand's exquisite range of gold and diamond jewellery.
"We would like to thank Aishwarya Rai Bachchan for augmenting the product propositions of brand over the last 3 years and helping it establish itself as a leading national brand.
"We welcome Sonam Kapoor and are confident that her status as a style icon and popularity will strengthen future product campaigns," Ramesh Kalyanaraman, Executive Director, Marketing and Operations, said in a statement here.
The company's other brand ambassadors are Nagarjuna, Prabhu, Shivaraj Kumar and Manju Warrier.