Mumbai -- Scores of Bollywood celebrities, including biggies like Shahrukh Khan, Hrithik Roshan and Aamir Khan, have attended the 40th birthday bash of friend and filmmaker Karan Johar Friday night, making it the industrys best party of the year. It seemed that the whole Bollywood fraternity, dressed in their best outfits mostly in black and white, came under one roof on the occasion. Johar, wearing a jet black Tom Ford suit, came to the party with mother Hiroo. He was soon joined by best friends Shahrukh Khan-Gauri, and Manish Malhotra, who has reportedly thrown this grand party for dear friend Karan. Not long after, Hrithik, Aamir, Sanjay Dutt, Riteish Deshmukh, Anil Ambani and Vidhu Vinod Chopra also came there with their respective wives. Actress Priyanka Chopra was also present at the party showing that she has forgiven Karan for his past uncomplimentary remarks. Dirty girl Vidya Balan also attended the event with boyfriend and CEO of UTV Motion Pictures Siddharth Roy Kapoor wearing a beautiful sari like always. Besides them, Bipasha Basu, Jaya Bachchan, Goldie Behl-Sonali Bendre, Boman Irani, Ronit Roy, Sonakshi Sinha, Kareena Kapoor and Karisma Kapoor also attended the party among others.