The actor plays a famously adulterous superstar who falls for Kapoor's leading actress in the film.
He told DNA India: "Bebo [Kapoor] is a fabulous co-star. We share a great working relationship. She is fun and easy to work with. It was great fun shooting for Heroine. Also since we have worked together before in We Are Family, we had a blast."
A source added: "Arjun is very excited about the film and is all praises for Kareena. He has been telling everyone how Bebo has outdone herself in the film. Arjun too is awaiting the film's release since he hasn't played a role like this."
In February, Rampal said that he sees the melodrama directed by Madhur Bhandakar as a "love story".
It was reported in the same month that he and Kareena Kapoor will film a sex scene together.