India, Jan. 10 -- Actress Saba Azad marked boyfriend and Bollywood superstar Hrithik Roshan's 52nd birthday with a series of warm and intimate pictures, calling him her 'heart'.

She wrote, "Nothing in the world makes me happier than seeing you happy. On the best day of the year I wish upon you joy and days of quiet, rest intercepted with days of fulfilling creation, work that deserves your talent, books that make you think, time with your friends and family and peace endless peace. Happy birthday my heart. I love you @hrithikroshan."

In one photo shared by Saba, the couple is seen smiling during what appears to be a relaxed outdoor ride.

Another click captures a cozy indoor moment, with Hrithik and Saba seated close together, sharing ...