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.

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"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
American actress Cameron Diaz is pictured after her arrival in Cannes to promote her film "The Mask," directed by Chuck Russell, during the 47th International Cannes Film Festival, May 17, 1994. (AP Photo/Rhonda Birndorf)
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)
Photo by: Russ Einhorn STAR MAX, Inc. - copyright 2000 ALL RIGHTS RESERVED Telephone/Fax: (212) 995-1196 6/3/00 Cameron Diaz at the MTV Movie Awards. (CA) (Star Max via AP Images)
Actress Cameron Diaz applauds before the start of game three of the Western Conference Finals between the San Antonio Spurs and the Los Angeles Lakers in Los Angeles Friday May 25, 2001. (AP Photo/Kevork Djansezian)
Nominee Cameron Diaz arrives at the 8th annual Screen Actors Guild Awards Sunday, March 10, 2002, in Los Angeles. The Screen Actors Guild Awards are chosen by the guild's 98,000 members, the awards are given in five film and eight television categories. (AP Photo/Kevork Djansezian)
Photo by: Russ Einhorn STAR MAX, Inc. - copyright 2002 ALL RIGHTS RESERVED Telephone/Fax: (212) 995-1196 3/24/02 Cameron Diaz at The 74th Annual Academy Awards. (The Kodak Theatre, Hollywood, California) (Star Max via AP Images)
American actress Cameron Diaz, left, and American director Martin Scorsese pose after the screening of a part of their film "Gangs of New York," which is out of competition at the 55th International Film Festival in Cannes, south eastern France, Monday, May 20, 2002. (AP Photo/Patrick Gardin)
Cameron Diaz pauses for photographers during the premiere of her new film "Gangs of New York" Monday, Dec. 9, 2002 in New York. (AP Photo/Robert Spencer)
American actress Cameron Diaz, left, and British actor Rupert Everett, right, smile during a press conference for their animated film "Shrek 2," in competition, directed by New Zealander Andrew Adamson, American Kelly Asbury and American Conrad Vernon, at the 57th International Film Festival in Cannes, southern France, Saturday, May 15, 2004. (AP Photo/Lionel Cironneau)
Actors Antonio Banderas, left, and Cameron Diaz pose for photographs in Beverly Hills, Calif., prior to the premiere of "Shrek 2," Saturday, May 8, 2004, in Los Angeles. (AP Photo/Chris Weeks)
Actress Cameron Diaz poses at the Rodeo Drive Walk of Style awards in Beverly Hills, Calif., Sunday, March 20, 2005. "Trippin'," her MTV series which premiers Monday night, March 28, 2005, follows Diaz and celebrity friends as they head to environmentally sensitive spots around the world and seek to discover ways to preserve them. (AP Photo/Chris Pizzello)
Actress Cameron Diaz waves as she arrives at Nickelodeon's 18th annual Kids' Choice Awards, Saturday, April 2, 2005, in Los Angeles. (AP Photo/Mark J. Terrill)
**FILE** Actress Cameron Diaz and Justin Timberlake watch the Los Angeles Clippers play the Los Angeles Lakers in this Sunday, April 9, 2006 file photo taken at a the Staples Center in Los Angeles. (AP Photo/Phil McCarten)
Actress Cameron Diaz poses on the red carpet during the William Rast Fashion Show at the Social Hollywood nightclub in Los Angeles, Calif. on Tuesday, October 17, 2006. (AP Photo/Dan Steinberg)
Actress Cameron Diaz appears on stage during MTV's "Total Request Live" show at the MTV Times Square Studios, Wednesday, Nov. 29, 2006 in New York. Diaz stars in the new film "the Holiday" which opens Dec. 8. (AP Photo/Jeff Christensen)
Actress Cameron Diaz arrives for the 79th Academy Awards Sunday, Feb. 25, 2007, in Los Angeles. Diaz will be a presenter during the Oscars telecast. (AP Photo/Kevork Djansezian)
Actress Cameron Diaz poses on the press line at the Los Angeles premiere of "Shrek The Third" in the Westwood area of Los Angeles, Calif. on Sunday, May 6, 2007. (AP Photo/Dan Steinberg)
Cameron Diaz arrives at the Metropolitan Museum of Art Costume Institute Gala in New York, Monday, May 7, 2007. (AP Photo/Seth Wenig)
Cameron Diaz arrives at the MTV Movie Awards in Los Angeles on Sunday, June 3, 2007. (AP Photo/Matt Sayles)
Cameron Diaz arrives for the 80th Academy Awards Sunday, Feb. 24, 2008, in Los Angeles. Diaz will be a presenter during the Oscars telecast. (AP Photo/Chris Pizzello)
Actress Cameron Diaz accepts the wannabe award during the 21st Annual Kids' Choice Awards in Los Angeles, on Saturday, March 29, 2008. (AP Photo/Matt Sayles)
Cameron Diaz arrives for the premiere of "What Happens in Vegas" in Los Angeles on Thursday, May 1, 2008. (AP Photo/Matt Sayles)
Actress Cameron Diaz appears onstage during MTV's "Total Request Live" at the MTV Times Square Studios Monday, May 5, 2008 in New York. Diaz stars in the new film "What Happens In Vegas" which opens nationwide on Friday. (AP Photo/Jason DeCrow)
Cameron Diaz, co-star of the new movie "What Happens in Vegas," appears on the NBC "Today" television program in New York's Rockefeller Center, Monday, May 5, 2008. (AP Photo/Richard Drew)
Cameron Diaz arrives at the 66th Annual Golden Globe Awards on Sunday, Jan. 11, 2009, in Beverly Hills, Calif. (AP Photo/Matt Sayles)
Actress Cameron Diaz arrives at the Independent Spirit Awards in Santa Monica, Calif. on Saturday, Feb. 21, 2009. (AP Photo/Evan Agostini)
Actress Cameron Diaz poses during a ceremony honoring her with a Star on the Hollywood Walk of Fame Monday, June 22, 2009, in Los Angeles, four days before the premiere of her latest film, "My Sister's Keeper." (AP Photo/Damian Dovarganes)
Actress Cameron Diaz poses at Comic-Con International 2009 convention held in San Diego Friday, July 24, 2009. The annual comic book and popular arts convention attracts over 100,000 people and runs through Sunday July 26. (AP Photo/Denis Poroy)
Cameron Diaz arrives at the Vanity Fair Oscar party on Sunday, March 7, 2010, in West Hollywood, Calif. (AP Photo/Peter Kramer)
Cameron Diaz arrives during the 82nd Academy Awards Sunday, March 7, 2010, in the Hollywood section of Los Angeles. (AP Photo/Matt Sayles)
Cameron Diaz attends the premiere of "Shrek Forever After" during the 2010 Tribeca Film Festival in New York, on Wednesday, April 21, 2010. (AP Photo/Peter Kramer)
Actress Cameron Diaz, recipient of CinemaCon's Female Star of the Year award, arrives at CinemaCon 2011, Wednesday, March 30, 2011, in Las Vegas. (AP Photo/Chris Pizzello)
US actress Cameron Diaz, arrives for the German premiere of the film "Bad Teacher " in Berlin, Germany, Friday, June 17, 2011. (AP Photo/Gero Breloer)
Cameron Diaz accepts the award for choice movie actress: comedy onstage at the Teen Choice Awards on Sunday, Aug. 7, 2011 in Universal City, Calif. (AP Photo/Chris Pizzello)
Cameron Diaz arrives before the 84th Academy Awards on Sunday, Feb. 26, 2012, in the Hollywood section of Los Angeles. (AP Photo/Chris Pizzello)
Cameron Diaz arrives at the Metropolitan Museum of Art Costume Institute gala benefit, celebrating Elsa Schiaparelli and Miuccia Prada, Monday, May 7, 2012 in New York. (AP Photo/Evan Agostini)
U.S. actress Cameron Diaz poses for photographers as she arrives for the European premiere of the movie 'What to Expect When You're Expecting' at a cinema in London, Tuesday, May 22, 2012. (AP Photo/Matt Dunham)
Cameron Diaz seen at Meet the Filmmakers: Gambit at The Apple Store on Wednesday, Nov. 7, 2012, in London. (Photo by Jonathan Short/Invision/AP)
Actress Cameron Diaz attends The Metropolitan Museum of Art's Costume Institute benefit celebrating "PUNK: Chaos to Couture" on Monday, May 6, 2013 in New York. (Photo by Evan Agostini/Invision/AP)
Leslie Mann, left, and Cameron Diaz, cast members in the upcoming film "The Other Woman," address the audience at the 20th Century Fox presentation at CinemaCon 2014 on Thursday, March 27, 2014 in Las Vegas. (Photo by Chris Pizzello/Invision/AP)
Cameron Diaz seen at theTwentieth Century Fox Los Angeles Premiere of 'The Other Woman' on Monday, April 21, 2014, in Westwood, Calif. (Photo by Eric Charbonneau/Invision for Twentieth Century Fox/AP Images)
Cameron Diaz attends the premiere of "The Other Woman" hosted by The Cinema Society and Bobbi Brown on Thursday, April 24, 2014 in New York. (Photo by Charles Sykes/Invision/AP)
Actors Jason Segel and Cameron Diaz attend a special screening of "Sex Tape" at the Regal Union Square on Monday, July 14, 2014, in New York. (Photo by Evan Agostini/Invision/AP)
Actress Cameron Diaz attends the Academy of Motion Picture Arts and Sciences private luncheon and viewing of the "Hollywood Costume" exhibition at the Wilshire May Company building on Wednesday, Oct. 8, 2014 in Los Angeles. (Photo by Dan Steinberg/Invision/AP)
Cameron Diaz attends the American Museum of Natural History's 2014 Museum Gala on Thursday, Nov. 20, 2014, in New York. (Photo by Greg Allen/Invision/AP)
Actress Cameron Diaz poses during a photo call for the film "Annie" at the Crosby Hotel on Thursday, Dec. 4, 2014, in New York. (Photo by Evan Agostini/Invision/AP)
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."

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