Nargis, who made her debut in Bollywood with the 2011 film "Rockstar", shared on Twitter to thank her fans and followers.
"Two million on Instagram. Just thought I'd share that with you. Thank you and have a lovely evening," she wrote.
On the movie front, the actress, who was also part of films like "Madras Cafe", "Phata Poster Nikhla Hero" and Hollywood film "Spy", is currently busy with "Azhar".