Sidharth Malhotra celebrated his 35th birthday at his Bandra home yesterday on January 16. Rumoured girlfriend Kiara Advani was the life of the party. If the pictures of the two that are doing the rounds of social media are any indication, it seems they are serious about each other. 

The two came close when Karan Johar cast them together in his ambitious film, Shershaah. The film was announced almost three years ago and ever since then, the mystery behind their relationship continues.