"I just don't get it," said a friend. "Your age starts with a four, you are a hermit, you never go out and you have integrity." Why is Eva Herzigova still in such high demand at 40?

SI Staff | Nov 25, 2013

SI Swimsuit, 1998 :: Russell James/SI

Baby Phat, 2003 :: Evan Agostini/Getty Images

Versace, 2003 :: Giuseppe Cacace/Getty Images

Heatherette, 2004 :: Thomas Concordia/WireImage

Dior Haute Couture, 2005 :: Tony Barson/WireImage

At the launch of her campaign for Chopard, 2006 :: Pascal Le Segretain/Getty Images

Louis Vuitton, 2008 :: Lorenzo Santini/WireImage

With Claudia Schiffer (left) and Nadia Auermann (center) in 2009 :: Vittorio Zunino Celotto/Getty Images

Jean Paul Gaultier for Hermes, 2010 :: Pierre Verdy/AFP/Getty Images

At Christian Dior, 2013 :: Jacopo Raule/FilmMagic

Victoria's Secret, 2001 :: KMazur/WireImage

Victoria's Secret, 2001 :: KMazur/WireImage

Backstage at Victoria's Secret, 2001 :: Evan Agostini/ImageDirect

SI Swimsuit, 1998 :: Russell James/SI

SI Swimsuit, 1998 :: Russell James/SI

SI Swimsuit, 1998 :: Russell James/SI

SI Swimsuit, 1999 :: Hans Feurer/SI

SI Swimsuit, 1999 :: Hans Feurer/SI

SI Swimsuit, 1999 :: Hans Feurer/SI

With Rebecca Romijn and Heidi Klum, 1999 :: Ron Galella, Ltd./WireImage.com

Victoria's Secret, 1999 :: Jon Gordon/Getty Images

Versace, 1999 :: Eric Feferberg/AFP/Getty Images

With Kate Upton backstage at Louis Vuitton, 2013 :: Petroff/Dufour/Getty Images