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".
Kareena Kapoor Khan looks in fab shape after weight loss! See photos
Mumbai food: 9 dishes to try during 9 days of Navratri
Photos: Hrithik Roshan, Nidhhi Agerwal and Adah Sharma walk the ramp
Photos: Shah Rukh Khan spotted with new set of wheels
Photos: Kareena Kapoor Khan, Kangana Ranaut at the Mumbai airport