Ranbir Kapoor is celebrating his 35th birthday today and the actor hosted a grand party at his Mumbai residence.Shah Rukh Khan, Aamir Khan and his wife Kiran Rao, Alia Bhatt, Sidharth Malhotra, Arjun Kapoor, filmmaker Karan Johar, Aditya Roy Kapur, Rajkumar Hirani, Imtiaz Ali, Anurag Basu, Imran Khan and his wife Avantika Malik were all part of the grand celebrations.