Inside pics: Alia, Sidharth and others party hard at Katrina Kaif's birthday bash

Mumbai: Katrina Kaif ringed in her 33rd birthday with her friends from B-Town in her plush apartment in Mumbai. Dressed in red bodycon dress, the actress looked breathtakingly gorgeous. 

We spotted the actress partying with who's who of Bollywood such as Alia Bhatt, Karan Johar, Sidharth Malhotra, Aditya Roy Kapur, Kabir Khan, Ali Abbas Zafar, Yasmin Karachiwala and others.

The actress, who so far steered clear of social networking sites, made her Facebook debut on her birthday as well. Katrina already has over 3.5 million likes on her page. 

Here are some inside pictures from Katrina's star studded birthday bash: