New Delhi, July 18 -- Kareena Kapoor Khan marked Priyanka Chopra's 44th birthday with a heartfelt social media tribute on Saturday, sharing a monochrome throwback photograph of the two actors and describing her industry peer as "extraordinary".

Posting the black-and-white image on her Instagram story, Kareena shared a candid, joyful moment featuring the two stars. The throwback photograph was sourced from Koffee With Karan, where the two stars appeared for a special episode.

Alongside the image, Kareena wrote, "Happy birthday to the extraordinary PC.. Sky will always be the limit for you... Have the best day." The message was accompanied by a heart emoji and a rainbow.

The two actors have previously shared screen space in 'Aitraaz' and...