"Camila and I have worked incredibly hard to feel confident and comfortable in the bodies that we have. It's an every day battle, sometimes," she wrote. "And to see our bodies become

"Camila and I have worked incredibly hard to feel confident and comfortable in the bodies that we have. It's an every day battle, sometimes," she wrote. "And to see our bodies become so distorted in an editing process is a perfect example of the obstacles we have yet to overcome."

Reinhart said she and her Veronica Lodge co-star wouldn't "hide behind Photoshop to conform to beauty standards."

"It's sad that you felt our bodies needed to be slimmed down," she wrote. "But Cami and I are f--king beautiful. As is. And you can't ‘fix' us."

She also sent her female followers some words of inspiration.

"So, like every other day, women….go kick some ass," she wrote. "You are being heard. You are strong and sensational."

Near the end of her post, she applauded Cosmopolitan U.S. for "keeping our waists as they are in their magazines." She also asked other celebrities to help put an end to the promotion of "unrealistic body image" through Photoshop.

"Also would like to encourage celebrities and public figures to stop photoshopping their waists/noses/arms/legs in their photos," she wrote. "It's only encouraging an unrealistic body image. It's adding to the problem."