Heidi Klum's foray into modeling may have been on a whim, when at 18 years old she sent Polaroids of herself to a German magazine; however, her faith and indefatigable work ethic has lead to multi-platform fame. After kicking off her career in Europe, the fresh-faced beauty moved stateside, scored the cover of Sports Illustrated's swimsuit issue in 1998 and earned her wings as a Victoria's Secret Angel.

As Heidi boldly bares all in ad campaigns and on the runway, she also brings this same sense of self-confidence to the red carpet. From thigh-skimming mini dresses to bump-baring gowns, the "Project Runway" host and mother of four's enviable figure is something we all aspire to as we head into bikini season.

In celebration of Heidi's 39th birthday on June 1st, we're taking a look back at the supermodel's stem-baring style over the years, including adorable Ken and Barbie-esque moments with ex Seal. Vote on all her looks in the slideshow below.

Flip through our many other Style Evolutions.

Meanwhile, check out Heidi's hair and makeup transformation.

Want more? Be sure to check out Stylelist on Twitter, Facebook, Tumblr and Pinterest.

Loading Slideshow...
  • 1990

    Photo: Time & Life Pictures/Getty Images

  • 1990

    Photo: Time & Life Pictures/Getty Images

  • 1990

    Photo: Time & Life Pictures/Getty Images

  • 1997

    Photo: Marion Curtis/DMI/Time Life Pictures/Getty Images

  • 1998

    Photo: Ron Galella, Ltd./WireImage

  • 1999

    Photo: Ron Galella, Ltd./WireImage

  • 1999

    Photo: Dave Hogan/Getty Images

  • 1999

    Photo: Diane Freed / Liaison Agency

  • 2000

    Photo: Getty Images

  • 2000

    Photo: Getty Images

  • 2000

    Photo: George De Sota/Liaison

  • 2000

    Photo: Frank Micelotta/Getty Images

  • 2000

    Photo: Nick Elgar/Getty Images

  • 2000

    Photo: Scott Gries/ImageDirect

  • 2001

    Photo: Vince Bucci/Newsmakers

  • 2001

    Photo: Anthony Harvey/Newsmakers

  • 2001

    Photo: DOUG KANTER/AFP/Getty Images

  • 2001

    Photo: Anthony Harvey/Getty Images

  • 2001

    Photo: TIMOTHY A. CLARY/AFP/Getty Images

  • 2002

    Photo: Anthony Harvey/Getty Images

  • 2002

    Photo: Mark Mainz/Getty Images

  • 2002

    Photo: Dimitrios Kambouris/Getty Images

  • 2002

    Photo: Lawrence Lucier/Getty Images

  • 2003

    Photo: Frank Micelotta/ImageDirect

  • 2003

    Photo: Evan Agostini/Getty Images

  • 2003

    Photo: Evan Agostini/Getty Images

  • 2003

    Photo: Evan Agostini/Getty Images

  • 2003

    Photo: TIMOTHY A. CLARY/AFP/Getty Images

  • 2003

    Photo: Sean Gallup/Getty Images

  • 2004

    Photo: Peter Kramer/Getty Images

  • 2004

    Photo: Matthew Peyton/Getty Images

  • 2004

    Photo: Evan Agostini/Getty Images

  • 2004

    Photo: Evan Agostini/Getty Images

  • 2004

    Photo: Carlo Allegri/Getty Images

  • 2005

    Photo: Carsten Koall/Getty Images

  • 2005

    Photo: Andreas Rentz/Getty Images

  • 2005

    Photo: Evan Agostini/Getty Images

  • 2005

    Photo: Kevin Winter/Getty Images

  • 2005

    Photo: Peter Kramer/Getty Images

  • 2006

    Photo: Evan Agostini/Getty Images

  • 2006

    Photo: Mark Mainz/Getty Images

  • 2006

    Photo: Evan Agostini/Getty Images for CFDA

  • 2006

    Photo: Kevin Winter/Getty Images

  • 2006

    Photo: Michael Buckner/Getty Images

  • 2007

    Photo: Frazer Harrison/Getty Images

  • 2007

    Photo: Ethan Miller/Getty Images for Full Picture

  • 2007

    Photo: Evan Agostini/Getty Images for CFDA

  • 2007

    Photo: Kevin Winter/Getty Images

  • 2007

    Photo: Charley Gallay/Getty Images

  • 2007

    Photo: Frazer Harrison/Getty Images

  • 2008

    Photo: Stephen Lovekin/Getty Images