"I won't be sharing much details about 'PK'. But it is one of the best roles in my nearly 25-year-long career," Aamir told reporters after the telecast of his show 'Satyamev Jayate' and also live screening of 'Mumkin Hai' programme here.
'PK' is an upcoming Hindi comedy-drama family film directed by Rajkumar Hirani, produced by Hirani, Vidhu Vinod Chopra and Siddharth Roy Kapur.
The poster of the film, showing Aamir almost in buff except a transistor covering his modesty, had caused a lot of furore recently.
Aamir also showered praises on Hirani, who has given super-hits like 'Munnabhai MBBS', 'Lage Raho Munnabhai' and' 3 Idiots', on the occasion.
"For me, Raju (Hirani) is avval (best) director. He is very kind and good person," the actor said.
The film is likely to be released on December 19.