Nowadays, cross promotion in Bollywood has become a common thing and Khans, mostly coming out in support is obviously beneficial for the makers for marketing their films. Something like that happened for ‘Ok Jaanu’ starring Aditya Roy Kapur and Shraddha Kapoor. Salman Khan who brought a new movement in Bollywood by going bare, struck his iconic pose with Aditya. Later, he took to Twitter to post the pic and threw a challenge to other actors – Aamir Khan, Shahrukh Khan, Ajay Devgn and Hrithik Roshan. Now, it is to see as who is the first one to take this challenge!