Adriana Lima 2013 Pirelli Calendar preview

Adriana Lima looks set to be the first pregnant model to grace the annual Pirelli Calendar. A regular feature within the calendar, a sneak peek of Lima exposing her baby belly has been revealed in the latest issue of Vanity Fair Italia. The magazine has published a series of behind-the-scenes photos from this year's shoot.

The 2013 Pirelli Calendar features Isabeli Fontana, Petra Nemcova, Liya Kebede, and the rumoured Karlie Kloss. They were reportedly photographed in Rio de Janeriro, Brazil in various exotic locations including historical areas and rural landscapes. Photographed by Steve McCurry, the models were asked to act as "protagonists involved in the support of foundation, NGO's, and humanitarian project." The calendar won't be released until December, so this pic will have to whet your appetite until then.

Adriana Lima announced in March that she was expecting her second child with former basketballer Marko Jaric. The couple already have a two-year-old daughter, Valentina.

"My favourite job in the world is being a mom! My family could not be more happy to announce this news!" she said on her Facebook page at the time. "The entire family is very excited, especially Valentina. She keeps blowing kisses to my belly and saying, 'Kisses for the baby.'"