Filmmaker Karan Johar had a special guest on the sets of his Ranbir Kapoor-starrer 'Ae Dil Hai Mushkil' in London as superstar Shah Rukh Khan dropped by to meet him and the whole team.

SRK on sets of 'Ae Dil Hai Mushkil' with Ranbir Kapoor and Karan Johar. Picture Courtesy Shah Rukh Khan's Twitter account