Nawazuddin Siddiqui and Ranbir Kapoor have formed a mutual admiration club, with both praising each other.

Nawazuddin, who plays Faisal Khan in "Gangs of Wasseypur 2" (GOW2), reveals that Ranbir messaged him saying he has become his fan, while he himself feels that the young actor is giving a new definition to the word stardom.

"Ranbir Kapoor messaged me and he wrote in it that he has become my fan forever. He himself is such a good actor. He is someone who is breaking superstardom, who is giving a new definition to the word stardom," the 37-year-old said here Tuesday in an interview.

"So it feels good that we have such actors who are doing different kinds of films. You can call them stars, superstars or actors. The way his career is shaping, he is definitely the new definition of superstar," he added.

Ranbir was last seen as lovelorn singer in "Rockstar" and in his next he portrays a deaf-mute boy in "Barfi".

Meanwhile, Nawazuddin says he gets "nervous before every scene", but "GOW 2" director Anurag Kashyap made him comfortable.

"Most of the times what you think doesn't happen, sometimes just 50 or 25 percent of what you think actually translates into the scene. But my director was such that I never needed to think anything. When you are with him, you feel like giving the best shot. I am so comfortable with Anurag Kashyap," said Nawazuddin.

"Gangs of Wasseypur - 2", picks up from where the first part of the film ended. It also stars Huma Qureshi. Set in Wasseypur in Dhanbad district of Jharkhan, both the parts are based on real life story.