The 39-year-old "Guru" star thanked his fans for helping him attain this milestone.
"And to you... The coolest crew in the whole wide world. Thank you!! Our family grows to 7 million. Big love," Abhishek posted on twitter.
The actor is currently busy with the Pro Kabbaddi League, in which he owns a team - the Jaipur Pink Panthers.
Abhishek will be next seen on the big screen in director Umesh Shukla's "All Is Well", which also stars Asin, Rishi Kapoor and Supriya Pathak.
The movie will hit theatres on August 21.