The actress, who turns 31 Thursday, corrected everyone who wished her through a post on her Twitter page.
"All lovely people who wished me today (Wednesday), please wish me again tomorrow (Thursday) as despite what Wikipedia tells you, my real birthday is 10th Jan," she wrote.
Kalki, last seen in "Shanghai", will soon be seen in debutant director Kannan Iyer's "Ek Thi Daayan" and Ayan Mukerji's "Yeh Jawaani Hai Deewani".
Pics: Prabhas, Tamannaah Bhatia at 'Baahubali 2' first look launch at MAMI
'Ae Dil Hai Mushkil' photos: Aishwarya, Anushka, Karan get candid at MAMI
Photos: Huma Qureshi, Neha Dhupia and other celebs at MAMI
Photos: Amy Jackson, Daisy Shah at Mumbai airport
Photos: Sridevi, Irrfan and other celebs at 'Mughal-e-Azam' screening