Saturday night saw a gala ‘ party with Karan’, as Bollywood director- producer Karan Johar threw a star- studded bash to ring in his 42nd birthday in Mumbai.Alia Bhatt and Sonam Kapoor looked stunning at the birthday bash.Hosted at his residence, cinema’s biggies were in full attendance, adding to the excitement of the celebration. Celebrities posed for the paparazzi as they entered the building. On the occasion, many ‘ new’ friends and faces pose at the ‘ it’ party of the season.Surprisingly, old time pals Shahrukh Khan and wife Gauri were missing from the do, possibly due to the growing rift over actor Salman Khan warming up to KJo over the recent past.Bipasha Basu poses with boyfriend Harman Baweja.Meanwhile, Koffee with Karan season 4 guests Aamir Khan and wife Kiran Rao were spotted entering the party hand- in- hand. While Khan stuck to his typical style of a T- shirt with jeans, sneakers and Chaplin hat, Rao sported a silver dress.Other couples to join the fanfare included Riteish Deshmukh and Genelia D’Souza, Sonali Bendre and Goldie Behl, and Bipasha Basu and Harman Baweja. While Vidya Balan and Siddharth Roy Kapur’s doting entrance quelled rumours of tension brewing between them, the relationship- status of actor Kunal Kapoor and Naina, neice of Big B.