Ace filmmaker Karan Johar extended birthday wishes to Shah Rukh Khan's son Aryan Khan, who turned 21 today. Taking to his official Twitter handle, Karan posted an adorable picture of himself with his 'baby boy' and SRK.

"My baby boy is 21 today!!!! I can't believe it!!! Felt my first parental pang when he was born!!! Happy birthday Aryan!!! You have been blessed with the most amazing parents!!!! @iamsrk @gaurikhan," Johar wrote alongside the photo.