Arjun's Twitter handle is @arjunk26, and he made his debut on the micro-blogging platform Tuesday.
His first tweet read: "I am being tutored by @anshulakapoor as we speak on how to handle my handle."
While Abhishek welcomed Arjun to the "chaos", in her welcome to her "Gunday" co-star, Priyanka posted: "Ladies n gentlemen... presenting...Arjun kapooor! Haha Welcome @arjunk26 baba!! give some love twitter verse."
Alia Bhatt posted: "And @arjunk26 is finally on twitter !!! C'mon c'mon give him all the love you've built up since forever."
Director Kunal Kohli warned him: "@arjunk26 another one bites the dust! Before you know it you're gonna be hooked on to twitter madness!"
Earlier Wednesday, Arjun posted: "Morning guys thank u fr all the love so far didn't expect it...unprecedented...still grappling with the workings of this place & #instagram."
The actor, son of film producer Boney Kapoor, already has over 41,000 followers and he himself is following 51 people, including names like Amitabh Bachchan, Anil Kapoor, Salman Khan, Priyanka, Karan Johar, Abhishek and Alia.