Demi Lovato inspired by Amy Schumer's Pirelli pose

Singer Demi Lovato is delighted Amy Schumer has challenged "society's twisted views" of perfection with her naked Pirelli calendar picture.

The Trainwreck actress is one of the famous faces featured in the 2016 edition of the iconic year planner, and for her black and white shot, she posed on a stool, wearing nothing but a pair of knickers and high heels, while holding a cup of coffee.

The image, shot by revered photographer Annie Leibovitz, evoked a huge reaction from the public, and high praise from Schumer's peers, including 23-year-old Demi.

The singer, who has battled body image issues all her life, believes Amy truly represents the message she is trying to get across in the lyrics to her songs on hit new album Confident.

"This is the perfect example of a #CONFIDENT woman taking a giant s**t on society's twisted views of what perfection is,” she wrote on Instagram on Tuesday (01Dec15) alongside the image of Schumer baring all. "I wrote Confident with women like her (men too) and examples like this in mind.

"The attitude captured in this photo is brave, sexy and inspiring but most importantly REAL!!!! F**k yeah @amyschumer... Women all over the world thank you for this. Especially me."

Demi spent time in rehab in 2011 and 2012, battling an eating disorder and other body-image related problems, but she bounced back to become a mental health campaigner and confident women's rights activist.

The Cool for the Summer singer even posed nude herself during a photoshoot with Vanity Fair in October (15), and then insisted the revealing shots of her should not be retouched.

"The most challenging part of that photoshoot for me was going in the buff with no Photoshop," she told Access Hollywood. “There were times where I was looking at the pictures with the photographer and he would say, 'Oh, we could fix that,' and I was like, 'No, we can't. We cannot use Photoshop in this shoot’.

"Of course it's awkward, but when I start to think about the message, when I would start to think about how many people this would inspire, I got more comfortable doing it."