Here is what what the celebrities have tweeted:
Aishwarya Rai Bachchan: Always my baby... Happy birthday baby.
Madhuri Dixit Nene: Abhishek Bachchan, wishing you a wonderful day and all the most amazing memories on your big day.
Genelia Deshmukh: Abhishek Bachchan wishing you a very happy birthday. Thank You for always being there for us. Warmest regards always.
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John Abraham: Happy birthday my dearest baba Abhishek Bachchan. To many more beautiful birthdays. May our 'Dostana' last forever.
Sonu Sood: Happy birthday mere bhai (my brother) Abhishek Bachchan. There can (be) no one like You. simply the best. Keep hating me because I love you the most.
Adnan Sami: Happy birthday dear Abhishek Bachchan, wishing you a wonderful day and a brilliant year ahead! Much love and duas.
Milap Zaveri: Happy birthday Abhishek Bachchan. You are one of the nicest people I have met and you deserve all the happiness in the world
Goldie Behl: This is not a throwback, it is happening right now as we post happy birthday little brother Abhishek Bachchan.
Aftab Shivdasani: Happy birthday Abhishek Bachchan! Here's wishing you a blessed day and prosperous year ahead buddy! Lots of love.
Here's wishing Abhishek Bachchan a very Happy Birthday!