Rajesh Khanna Birthday Anniversary: Know interesting facts about Rajesh Khanna. Fondly known as Kaka he was just a 25-year-old young man when he became a superstar overnight. With 16-17 super-hit films in a row, Rajesh Khanna is the first superstar of Bollywood.On this birth anniversary let’s put light into some of his incredible work. Rajesh Khanna’s name brings to our mind innumerable songs picturized on him most of them sung by Kishore Kumar who came to be known as his voice. Almost all his songs were super-hits probably because his face expressions and expressive eyes added so much life in the songs that they became extensions of his personality.