Superstar Shah Rukh Khan has heaved a sigh of relief as he has wrapped up the shooting of his forthcoming release "Chennai Express". "Shooting for 'Chennai Express' wraps. About 18 hours non-stop. My feet feel big and thus the world smaller... I can walk around it into the dawn now," Shah Rukh posted on Twitter. "Chennai Express" is an action-comedy directed by Rohit Shetty and also features Deepika Padukone. It was earlier scheduled to released Aug 8, but it will now hit the screens Aug 9.