Siddharth is a contestant on 'Jhalak Dikhhla Jaa 6', while Karan is one of the judges along with Madhuri Dixit and Remo D'Souza.
The actor, along with his choreographer Sonia Jaffer did a mix of contemporary and rumba dance forms for the forthcoming fusion episode. They danced to the number 'Tere bin main yun kaise jiya'.
The act led Karan to say, "If 'Jhalak...' was a movie, you would have been the hero of it. Your personality and charisma has the quality of a hero," revealed a source from the set.
The filmmaker also said how Siddharth will be noticed on whichever platform he performs, and that he has a hero-like quality in him.
Spotted: Lara Dutta, Mahesh Bhupathi with their daughter in Bandra
Photos: SRK, Tamannaah Bhatia, Varun Dhawan at Mehboob Studio
Birthday special: Sushant Singh Rajput's journey from TV to films
Photos: Vibrant Sonakshi Sinha opens LFW 2017 on a cruise ship
Health in pictures: 8 reasons why people have unprotected sex