Shah Rukh Khan and Katrina Kaif are in complete promotional mode, with the release of ‘Zero’ just around the corner. Shah Rukh and Katrina will join Salman Khan on the sets of Sallu’s reality show ‘Bigg Boss’ season 12 to promote their film ‘Zero’. The said episode of ‘Bigg Boss’ will be aired over the weekend. Salman and SRK will promise some banter and brotherly feeling. Katrina Kaif was reportedly not going to be a part of the promotional gig but finally shot her portion in the entertaining episode. Directed by Aanand L Rai, ‘Zero’ features Shah Rukh Khan in a dwarf avatar, as he romances two beauties of Bollywood, Anushka Sharma and Katrina Kaif. The much-promoted film is scheduled to hit the screens on December 21, banking on the Christmas week at the box office.