Other guests to arrive at the party included Katrina Kaif, Jacqueline Fernandez, Parineeti Chopra, Manish Malhotra and Sonakshi Sinha.
The Akhtars - Farhan and sister Zoya - as well as Sidharth's Baar Baar Dekho producer Ritesh Sidhwani were also present at the do.
She made an early entry with her BFF Akansha Ranjan and sister Shaheen, and stayed right until the end.
Sidharth Malhotra was greeted to a full house on the eve of his birthday last evening, when a "small get-together" turned out to be a grand surprise, with his close friends in attendance at mentor Karan Johar's home.
The director, who only last year hosted a splendid bash for buddy Manish Malhotra on his 50th birthday, left no stones unturned for Sidharth either.
He even opened up about how he does not like being questioned about his marriage.
"There was a time that I really did want to get married, and then it just didn't work out. He admitted that wedding cards for him and his former flame Sangeeta Bijlani were printed but it was all called off because she caught him cheating on her. I don't want that somewhere in somebody else's mind that thought about ex-boyfriend you know." But he quickly added that there was no running away from Sangeeta Bijlani as she was like family to him.
• In 2015, an FIR was lodged against Karan and actors Ranveer Singh and Arjun Kapoor for their participation in the controversial 'AIB Roast'.