Cameron Diaz, 43, is completely makeup-free in bold new pic

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Cameron Diaz Goes Makeup Free on New Book Cover

Cameron Diaz posted what might be her most revealing Instagram photo yet.

The 43-year-old actress is not wearing a stitch of makeup in a pic she shared with her 2.3 million followers on Wednesday afternoon, while posing with her upcoming new book, The Longevity Book, which hits stores on April 4. While the snap is striking, Diaz's accompanying message about aging is even more powerful.

WATCH: Benji Madden Wishes Wife Cameron Diaz a Happy Birthday -- 'I'm the Luckiest Guy Alive'

"I want to let you all off the hook of thinking you need to fit in to one picture of health in order to achieve wellness," she wrote in a blog post on OurBodyBook.com. "So, let's start celebrating and living an engaged life, and stop punishing ourselves for not looking a certain way, and instead holding ourselves accountable for actually taking care of ourselves inside first, knowing the results on the exterior will be a shining side effect."

Cameron Diaz through the years:

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Cameron Diaz through the years
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Cameron Diaz, 43, is completely makeup-free in bold new pic
BEVERLY HILLS, CA - JULY 28: Actress Cameron Diaz attends 'The Mask' Beverly Hills Premiere on July 28, 1994 at the Academy Theatre in Beverly Hills, California. (Photo by Ron Galella, Ltd./WireImage)
WESTWOOD, CA - JUNE 9: Actress Cameron Diaz attends the 'Batman Forever' Westwood Premiere on June 9, 1995 at Mann Village Theatre in Westwood, California. (Photo by Ron Galella, Ltd./WireImage)
Keanu Reeves and Cameron Diaz having beers in a scene from the film 'Feeling Minnesota', 1996. (Photo by Fine Line Features/Getty Images)
Cameron Diaz in a scene from the film 'Head Above Water', 1996. (Photo by New Line Cinema/Getty Images)
Cameron Diaz (Photo by Jim Smeal/WireImage)
Cameron Diaz during ''My Best Friend's Wedding'' New York City Premiere Party at Plaza Hotel in New York City, New York, United States. (Photo by Ke.Mazur/WireImage)
NEW YORK CITY - OCTOBER 3: Actress Cameron Diaz attends 'A Life Less Ordinary' New York City Premiere on October 3, 1997 at Village East Cinemas in New York City. (Photo by Ron Galella, Ltd./WireImage)
Cameron Diaz & Matt Dillon at the Mann Village Theatre in Westwood, California (Photo by Steve Granitz/WireImage)
Cameron Diaz at premiere of 'Very Bad Things,' New York, November 16, 1998. (Photo by Steve Eichner/Getty Images)
LOS ANGELES, CA - JANUARY 27: Benji Madden (L) and Cameron Diaz attend a basketball game between the Washington Wizards and the Los Angeles Lakers at Staples Center on January 27, 2015 in Los Angeles, California. (Photo by Noel Vasquez/GC Images)
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While promoting her first book, The Body Book, in 2014, Diaz talked candidly with ET about aging in Hollywood. When asked about her feelings toward getting Botox, she said that she wasn't pleased with the results. "It changed my face in such a weird way that I was like, 'No, I don't want to [be] like [that],'" she shared. "I'd rather see my face aging than a face that doesn't belong to me at all."

WATCH: Cameron Diaz Says Sex Is Her Secret to Staying Young

ET FIRST: Cameron Diaz Regrets Botox


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