Here's what celebrities like Arjun Rampal, Karan Johar and Abhishek Bachchan posted on Twitter:
Arjun Rampal: Happy birthday Farhan Akhtar. Mere dost mere bhai (my friend, my brother). Welcome to the 40s and rock on forever. Love and a big hug.
Karan Johar: Happy Birthday Farhan Akhtar! Known you for over three decades and here's to many more! Big love and all the happiness! Huge hug!
Abhishek Bachchan: Here's wishing my buddy Farhan Akhtar the happiest birthdays of all. Bas tu bhaag Farhan! Big love.
Farah Khan: Happy birthday to Farhan Akhtar and me, the only two members of "Capri9" (Capricorn Jan 9).
Nikhil Advani: Happy birthday. Power to you and how you've constantly been changing the film scene. Showing all of us the way it can be done.
Arshad Warsi: Happy Birthday to the super talented Farhan Akhtar. Bhaagwati.
Ehsaan Noorani: Happy Birthday Farhan Akhtar. Have a super one bro!
Punit Malhotra: Farhan Akhtar, Happy birthday. Hope you have a super day and a rocking year ahead.
Riteish Deshmukh: Bas tu Bhaaag Farhan Akhtar - janamdin ki haardhik shubh kaamnayein (keep running Farhan Khan - wish you happy birthday).
Shekhar Ravjiani: Happy Birthday Farhan! Rock on brother
Satish Kaushik: Wishing you a happy birthday my dear. More happiness, more success is in store for you. Proud of you 'Milkha'.
