Katrina is a modern day marvel: Big B

Bachchan, who caught up with actors Ranbir Kapoor and Katrina Kaif on the sets of reality show Bigg Boss 3 recently, is all praise for the latter and says she is a "modern day marvel".

"Katrina is a modern day marvel. From a non-Hindi speaking young shy and uncertain lady of Boom', she has grown and grown to become one of the most desired actresses in our fraternity," Amitabh posted on his blog.

While Amitabh hosts the reality show, Ranbir and Katrina had appeared to promote their film Ajab Prem Ki Ghazab Kahani.

"They (Ranbir and Katrina) were charming and involved and sweet. Ranbir as you all know is related to me. His cousin - son of Rishi Kapoor's elder sister - is married to my daughter Shweta," he said.