Rai on Wednesday night took to Twitter, where he shared a caricature of Shah Rukh's character from his upcoming film "Zero".
"I really don't know whether it is this fantastic person or the magical actor in him who brings a smile to my face and happiness on the sets. Love you Khan Saab Shah Rukh Khan. Have enjoyed every moment of filming 'Zero'!" he captioned the caricature.
The movie is slated to release on December 21.