And the celebrities also had a special message for the 'Bobby' star -- keep on inspiring.

The actor has been part of the industry for over four decades and has given hits like 'Mera Naam Joker', 'Bobby', 'Khel Khel Mein', 'Hum Kisise Kum Naheen', 'Karz' and 'Prem Rog'. The actor was last seen on screen in the 'Kapoor & Sons'.

Here's what the celebrities had to say on Rishi's birthday:

Amitabh Bachchan:
Happy Birthday Chintu ji...Love and happiness always...Chintu, we did some great films together!

Sajid Khan: Happy birthday Rishi Kapoor a friend whom I admire and respect a lot...Twitter is your domain sir...keep tweeting.

Huma Qureshi: Happy birthday Rishi Kapoor. Wish you all the joy and happiness in the world...You keep inspiring and entertaining sir film after film.

Abhishek Bachchan: Happy birthday to the coolest! Have a great day Rishi Kapoor. Lots of love.

Riteish Deshmukh: Happy Birthday Rishi Kapoor sir...So much to learn from you... Glad that I got a chance to work with you - much love.

Farah Khan: Happy birthday to my childhood crush Rishi Kapoor...No one can still do a song like you did!

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