Ranbir Kapoor is busy shooting for his Raj Kumar Santoshi’s flick Ajab Prem Ki Ghazab Kahani, but the young actor is actually very uncomfortable on the sets of his film, since Upen Patel ( Deepika ex-boyfriend ) who has a cameo in the film has turned up.

A source tells, “Though Upen was penciled in by Santoshi earlier, this is his first shoot schedule for the film. Ranbir and Katrina Kaif play the lead but Upen also has a considerable role in it. Apparently, there is discomfort between Ranbir and Upen and everyone knows the reason. It is clear that they share cold vibes with both keeping to themselves.”

The source includes, “As Kapoor had a busy day at the shoot, Deepika had to spend time waiting for him. The big question was how Deepika and Upen would react when they would come face-to-face with each other on the sets. Moreover, all the stars are put up in the same hotel, so they were bound to bump into each other.”

Well the title is suitable for the Ranbir-Deepika-Upen as Ajab Prem Ki Ghazab Kahani!!