Karan-Rani's jig

We hear Karan Johar was at his humorous best as he shot with Rani Mukerji on Jhalak Dikhhla Jaa.

Our source says, "When asked to dance with Rani, Karan said, "How can I dance with my bhabhiji?" However, the duo did end up dancing to the title track of Kuch Kuch Hota Hai."

The actress was also seen giving female contestants tips on how to be the perfect Yash Raj heroine.