Sidharth Malhotra rings in his 32nd birthday today, celebrated the big night with all his close friends from the film fraternity.His mentor Karan Johar threw a lavish birthday party for Sidharth at his Mumbai residence. Just like any other party at Karan’s residence, this too turned out to be a star-studded affair.Be it Sidharth’s Baar Baar Dekho co-star Katrina Kaif, or his Reload co-star Jacqueline Fernandez, who accompanied him on Koffee With Karan 5 recently, they were all there. We also spotted Sonakshi Sinha, Parineeti Chopra, Raveena Tandon, Farhan Akhtar, Ayan Mukerji, Ritesh Sidhwani and a few others.However, the most anticipated person, Sidharth’s alleged girlfriend Alia Bhatt was missing from this bash. We wonder what kept her so busy! Nevertheless, according to reports the duo was spotted having a quiet lunch earlier in the day.