The shooting was originally supposed to begin in Miami, USA, but due to budget concerns this was scrapped.The first phase of filming began in India in March 2010 till May 2010 in Mumbai's Film City and Goa.The crew then moved on to London in June 2010 where the filming with the entire cast took place during July–August and has been completed.In an interview, Khan stated that the remaining portions would be completed in India & would require further 6 months of post production. Khan also requested his long time collaborator & director Karan Johar to be present during shoot in London.While they were in London, media reports suggested Johar may have directed some romantic portions of the film; this was later denied by the director.Written by www.moviencelebrity.com