Created by famous photographer Annie Leibovitz, the 43rd edition of the calendar features the world's most inspiring women from athletes to artists and even bloggers. The calendar includes 13 women who are of outstanding professional, social, cultural, sporting and artistic accomplishment.
For the semi-nude shoot, Williams sported a pair of black underwear showing off all her muscles and embracing her body shape. "This calendar is so completely different. It is a departure. The idea was not to have any pretense in these pictures and be very straightforward,” explained Leibovitz.
Unfortunately, the calendar is not for sale and is only sent to a select few. In the meantime, check out some behind-the-scenes look of the shoot.