The 50-year-old actor, who shared screen space with Salman in the 1994 cult comedy Andaz Apna Apna, took to Twitter to share the excitement.
Can't wait to watch Bajrangi Bhaijan!!!? Aamir Khan (@aamir_khan) July 16, 2015
Aamir, whose Twitter outings are rare, was one of the early birds to unveil the first look of Bajrangi Bhaijaan on the microblogging site in May.
The two stars have always remained friends since they appeared together in Andaz Apna Apna.
Bajranji Bhaijaan also stars Kareena Kapoor Khan, Nawazudding Siddiqui and child artist Harshaali Malhotra.
Directed by Kabir Khan, the film releases on July 17.