Comprising a grid of nine photos, the 'Dangal' star shared a photo of his mother.
He captioned the post as, "The person because of whom I am who I am..."
Aamir has over 23 million followers on Twitter whereas his Facebook page is liked by 15 million people.
Bollywood's 'Mr. Perfectionist' made his debut in the Industry with the film 'Qayamat Se Qayamat Tak' in 1988.
The 'Thugs of Hindostan' star, who currently enjoys a massive social media following through Facebook and Twitter, on Tuesday, joined the Instagram family.