A video shows filmmaker Karan Johar dancing to the song 'Prem Ratan Dhan Payo' at actress Sonam Kapoor's wedding reception on Tuesday. The song, which is from the 2015 film of the same name, was picturised on actor Salman Khan and Sonam. Johar also danced on other songs like 'Say Shava Shava' and 'Saajan Ji Ghar Aaye'.