Amitabh Bachchan's over four decade-long career in showbiz stands as a "treasure of teachings" for actors and filmmakers, who have wished the Bollywood "legend" and "Shahenshah" the best of health on his 72nd birthday on Saturday.

A slew of Hindi film celebrities took to Twitter to share their wishes for the actor.

Here's what they tweeted:

Priyanka Chopra: Happy birthday to the formidable, the legendary @SrBachchan. Thank you for the inspiration sir...Health and happiness always.

Karan Johar: Reverence...Respect and immense admiration to @SrBachchan !! Happy birthday amit uncle! We are blessed to be around u.

Farhan Akhtar: Happy birthday Amit uncle. @SrBachchan From watching your films to watching you work, you continue to inspire. Love & best wishes always.

Anushka Sharma: Happy birthday @SrBachchan. Thank you for inspiring us with your work and your being. You truly are the best actor we have.

Dhanush: @SrBachchan happy birthday sir. YOU ROCK! #simplythebest

Nikhil Dwivedi: @SrBachchan Happy Birthday sir. For everything that you've given us. It's a treasure of teachings!

Sangeeth Sivan: Happy B'day Sir @SrBachchan - awe and inspiration never cease with you #truelegend.

Rohit Roy: Happy bday to the bestest brother in the world @RonitBoseRoy, and happy bday to the bestest everything in the world @SrBachchan.

Genelia D'Souza: Happy Birthday Sir @SrBachchan. There is no greater superstar than u.

Boman Irani: The world's collective wishes are like a 'force of nature' that honour you and love you. Happy Birthday Amitji!!!

Milap Zaveri: The 1st time I wrote a dialogue for the Shahenshah in #Kaante my hands quivered! Happy birthday @SrBachchan Sir! You inspire all of us!

Sujoy Ghosh: Sir @SrBachchan a very happy birthday. Aapni chilen bolei aamra aachi... proud to be a fan.

Nikhil Advani: The reason to make films for me was fulfilled when as an AD, I instructed @SrBachchan "your look is left of camera sir!". Happy bday sir.

Riteish Deshmukh: There never has been. There never will be. The One - The Legend. Happy Birthday Sir @SrBachchan.

Vishal Dadlani: The only true megastar, and one of the kindest, nicest and humblest people I know. @SrBachchan Sir, love and respect always! Happy Birthday!

Anubhav Sinha: Happy Birthday Sir. May God give you a thousand more of Health. Happiness. Peace. @SrBachchan

Sophie Choudry: Happy b'day to the ultimate legend @SrBachchan! Words aren't enough to describe how much we love u! Happiness & health to u always.