The musical film, about a girl who aspires to be a singer, has been directed by Aamir's former assistant Advait Chandan.
The poster, which was shared by Aamir on social media, sees a school girl walking with a backpack. A microphone is seen peeking out of her bag.
Aamir also features in the film alongside his "Dangal" co-star.
The teaser of "Secret Superstar" was released in December last year.
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