Filmmaker Rajkumar Hirani who is known for making films like 'Munna Bhai M.B.B.S', 'Lage Raho Munna Bhai', '3 Idiots', 'PK', and 'Sanju' has recently completed 20 years in the industry. He is currently gearing up for the release of 'Dunki' which is all set to hit the screens on December 21. The film marks Rajkumar Hirani and Shah Rukh Khan's first collaboration. Actor Aamir Khan who earlier worked with Hirani in 'PK' and '3 Idiots' is excited about 'Dunki' and he has sent his best wishes.