Ranbir, Katrina, Sonam, Ranveer at Arjun Kapoors birthday bash Ranbir Kapoor, Katrina Kaif, Sonam Kapoor, Ranveer Singh, Karan Johar at Arjun Kapoor's birthday party in Mumbai, Ranbir, Katrina, Sonam, Ranveer at Arjun Kapoors birthday bash Bollewood Event photos