Serena Williams joined in by posing for a Pirelli calenda.r This image appears in the gallery:10 Instagram Pictures You Shouldn't Have Missed This Week (4th December 2015) 5. Serena Williams joined in by posing for a Pirelli calenda.r Picture: Serena Williams Pirelli Calendar photoshoot 10 images See the full gallery: 10 Instagram Pictures You Shouldn't Have Missed This Week (4th December 2015)