"Yes, he (Tata) has invested in brand Kaaryah," said Agarwal, confirming Tata's latest venture capital move.
"We are very honoured to have him invest in his personal capacity. His investment is a great endorsement to our vision," she added.
However, Agarwal, who is also CEO of Kaaryah, did not reveal any financial details of Tata's newest investment.
Kaaryah offers western wear in 18 sizes and introduces 150 new designs and patterns every month.
The fashion portal launched in September 2013 focuses on offering Indian women the perfect fit for western formal wear.
Agarwal is an alumna of Kellogg Business School of North Western University, Chicago.
After retiring as the chairman of Tata Group in 2012, Ratan Tata has transformed into a prolific venture capital investor.
His other major investments went into Cardekho.com, Bluestone, Urban Ladder, Snapdeal, Xiaomi, Paytm and Altaeros Energies.