The star couple completed 36 years together on Friday.
Rishi took to Twitter to thank all his well wishers.
Rishi and Neetu have two children together - son and actor Ranbir Kapoor and daughter Riddhima Kapoor.
Soon after Rishi's tweet, many fans took to the micro-blogging site to wish good health to the 'Bobby' star.
One fan wrote: "@chintskap Take care sir". Another one wrote: @chintskap 'Health is Wealth' take care of it sir.`
Wishes also came in from his fans abroad.
One wrote: `@chintskap Stay blessed sir. Beautiful flowers for you sir. Lots of respect from Rani. Here from Denmark.`
Ace choreographer-filmmaker Farah Khan also wished 'happy anniversary' to the couple.