`Hey Shah, many happy returns of the day. May you continue to shine and give us joy. Love,` Aamir tweeted.
Aamir and Shah Rukh are two of the film industry's `Three Khans`, whose positions are viewed by many. The third is Salman Khan.
Aamir has never shared screen space with the 'King of Romance' Shah Rukh, but has always maintained a cordial relationship with him.
Meanwhile, Shah Rukh, who started his journey in showbiz with a television serial, is now known as Bollywood's 'Badshah' with hit films like "Baazigar", `Karan Arjun", "Dilwale Dulhania Le Jayenge", "Kuch Kuch Hota Hai" and "My Name Is Khan".
He is gearing up to bring his magic on the silver screen again with `Dilwale`, `Fan` and `Raees`.