Believe it or not, over a dozen of your favorite female stars have hit the big 4-0 -- and they look better than ever.

Take Gwyneth Paltrow for example -- the Oscar-winning actress has always been a stunner, but once she hit 40, the mom-of-two pushed it into high-gear. Not only does she eat right and cleanse her system any chance she gets, her body is INCREDIBLE ... thanks in part to her trainer and friend, Tracy Anderson.

"Ever since I've turned 40 [in September], I feel younger than ever and more energetic," the World's Most Beautiful Woman recently told E! News.

And her BFF and fellow 40-er Cameron Diaz agrees. After celebrating her milestone birthday, Diaz told Esquire U.K., "Getting older is the best part of life. Like, I know more than I've ever known. I have gratitude. I know myself better. I feel more capable than ever. And as far as the physicality of it -- I feel better at 40 than I did at 25."

Check out other 40-year-old stars and their transformations:

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  • Gwyneth Paltrow

    1996

  • Gwyneth Paltrow

    2013

  • Cameron Diaz

    1994

  • Cameron Diaz

    2013

  • Kate Beckinsale

    1999

  • Kate Beckinsale

    2013

  • Tori Spelling

    1992

  • Tori Spelling

    2013

  • Alyssa Milano

    1992

  • Alyssa Milano

    2013

  • Heidi Klum

    1998

  • Heidi Klum

    2013

  • Roselyn Sanchez

    2001

  • Roselyn Sanchez

    2013

  • Molly Sims

    2000

  • Molly Sims

    2013

  • Elisabeth Rohm

    2001

  • Elisabeth Rohm

    2013

  • Portia de Rossi

    1994

  • Portia de Rossi

    2013

  • Jenny McCarthy

    1996

  • Jenny McCarthy

    2013

  • Jennifer Esposito

    1997

  • Jennifer Esposito

    2012

  • Sasha Alexander

    2001

  • Sasha Alexander

    2013

  • Gabrielle Union

    2000

  • Gabrielle Union

    2013

  • Elizabeth Berkley

    1996

  • Elizabeth Berkley

    2011

  • Ali Landry

    1996

  • Ali Landry

    2012

  • Eva Herzigova

    1997

  • Eva Herzigova

  • Juliette Lewis

    1992

  • Juliette Lewis

    2013

  • Sofia Vergara

    2000

  • Sofia Vergara

    2013