Well, whoever this 'Fan' is, he/she seems to be quite aware of Sid and Alia's blossoming love story. What is more intriguing is, neither Sidharth nor Alia has bothered to clear the 'picture'.
Sidharth Malhotra and Alia Bhatt can keep denying that they are dating, but not many seem to be believing them. Recently, this photo of Sidharth planting a peck on Alia's cheek appeared on a fansite.