N. Vinayakumaran Nair, assistant commissioner of police, who heads the Hi-Tech Crime Enquiry Cell, said a probe had begun following a complaint from the parents of the woman whose picture was misused.
"We have written to the site which posted the picture. It should have been removed by now," Nair told IANS.
He said soon after the picture was posted, there were numerous comments saying it was fake.
"We are certain we will soon find out how this happened," he said. Nair did not disclose the complainant's name.
Photos: Shah Rukh Khan, Deepika Padukone, Alia Bhatt at an awards show
Photos: Big B, Iulia Vantur at Himesh Reshammiya's album launch
Photos: Aamir Khan with 'Dangal' actresses at fashion show
Spotted: Twinkle Khanna, Shriya Saran at an event in Mumbai
Andrew Flintoff's birthday: 10 players who entered different sports