Here's what celebs had to say:
Sonam Kapoor: Happy birthday Junior Bachchan! You by far the nicest, coolest person I know.
Bipasha Basu: Happy, Happy Birthday Junior Bachchan! Love and Hugs from Bippy (Bipasha).
Neil Nitin Mukesh: Wishing my elder brother Junior Bachchan a very happy birthday. Lots of love to you brother.
Tarun Mansukhani: Wishing my friend Junior Bachchan a very very happy birthday. Big and tall hug to you.
Aadesh Shrivastava: Happy Birthday Brother. God bless you with all happiness Junior Bachchan.
Rohan Sippy: Junior Bachchan wishing you the 'baap' of all birthdays - have a great one(SIC).
Rana Daggubati: Happy Birthday to the coolest co-star ever Junior Bachchan. Have a superb year chief.
Viveck Vaswani: Happy Birthday Abhishek Bachchan! May you have many more!
Vishal Malhotra: Happy Birthday Junior Bachchan.
Divya Dutta: Junior Bachchan a very happy birthday! Big hug and god bless.