Reports of break up between the two Bollywood stars has jolted  the industry. It is said that the would be real couple of Katrina Kaif and Ranbir Kapoor  is faced with a fresh  trouble. Apparently, the news of absence of Katrina Kaif at the recent  `Tamasha`s success party  led to  this speculation . Incidentally, after a series of flops, Bollywood actor Ranbir Kapoor is finally tasting success with the release of his new movie `Tamasha` . And, the  who`s who of the film industry gathered at a suburban nightspot to celebrate the film`s success, save Katrina Kaif. She was conspicuous by her absence.  Significantly,  Ranveer Singh came down to support ladylove Deepika Padukone. Ranbir`s alleged girlfriend Katrina Kaif was missing from the bash.  Is it that Kat was avoiding coming face-to-face with Ranbir`s former flame and co-star, Deepika Padukone ? Sources close to Kat claimed that she was invited for the party, but couldn`t make it as she was busy shooting for a brand endorsement till late night.