"Saw some footage of dad's next as an actor called 'Happi... Just stunned with what I saw... Amazed at how he creates a new person with every role he does, " Shahid posted on micro-blogging site Twitter.
"Happi" is being directed by Bhavna Talwar who had cast the veteran actor in her debut movie "Dharm".
The young actor is currently shooting for his dad's directorial debut "Mausum" in Edinburgh with Sonam Kapoor.
"I feel like I'm looked after by dad... No better feeling both as an actor and a son, " he wrote.