Leibovitz show arrives in Milan, includes Miuccia Prada and possibly mystery Italian writer

American photographer Annie Leibovitz's traveling exhibition of women's portraits will include leading Italian fashion designer Miuccia Prada. The photographer hopes to add a layer of mystery to "Women: New Portraits" when it sets down in Milan - by including the image of the writer who's identity is a closely-guarded secret.

The show, which began its tour in London and is a continuation of a project started in 1999, features images on a panel where some spaces have been left blank.

Leibovitz aims to fill those holes with new photos as the show moves around the world and said writer Elena Ferrante - known for the popular Neapolitan Novels that chronicle two women's life-long friendship - was on her Italian wish list.

But Ferrante's identity is unknown, making it probable that Leibovitz will have to content herself with just a single Italian subject, fashion designer Miuccia Prada.

Prada will join the likes of activist and Nobel laureate Malala Yousafzai, singer Adele and Facebook executive Sheryl Sandberg, when the exhibition goes on display at Milan's former light bulb plant Fabbrica Orobia from Sept. 9 to Oct. 2