The 'Pink' star took to his blog and recalled Abhishek's childhood days as he wrote, "It is beyond thought that the one that sat in wonder by the steps of the house on location, two front fingers in his mouth, hair independent of any set fashion hanging loosely over his broad forehead, a warm jacket keeping the cold of the hills at bay .. watching his Father shoot for his profession, silently."
He further said, "Abhishek .. the enunciation process and prayer to the God's .. even now has that same wonder and questioning nature .. is a lot more quieter than his younger sitting on Father's lap days .. and taller .. but still the nature similarity!"
Big B also posted some pictures of the actor's growing years on Twitter and wrote, "#HBDAbhishekBachchan .. who is in a time zone out of the country .. !! Ek Samay tha pita putra ka haath thaam ke chalta tha, ab putra haath thaam ke chalata hai pita ko"
The 'Guru' star rang in the special day in Australia with wife Aishwarya Rai Bachchan and daughter Aaradhya.
Veteran actor Anil Kapoor, along with other stars too wished the 'Housefull 3' star a happy birthday. Here's what they tweeted:
Anil Kapoor: Happy Birthday to the oh so witty & charming @juniorbachchan!! May you reach new heights as an actor & entrepreneur! Have a fantastic year! Lots of love!
Farah Khan: Our relationship in a picture he pretends he hates me overprotecting n mothering him, while actually loving it!! Happy birthday 2 my favourite boy @juniorbachchan 1of the finest actors iv worked with.. LOVVV UUU
Farhan Akhtar: Happy birthday @juniorbachchan .. big hug & best wishes always brother.
Huma Qureshi: Happy bday @juniorbachchan !! Thank u for being my first 'co-star' from my curly hair days .. have a great year ahead
Bhumi Pednekar: Happy birthday @juniorbachchan.Wishing you the bestest year ahead