Demi Lovato's nude photo scandal with Wilmer Valderrama is apparently not bringing her down as she tweeted that she remains strong amid the controversy.

The "Skyscraper" singer posted a photo on Saturday with boxing gloves on and preparing to work on the punching bag. The photo came with the caption: "Soy fuerte. Soy luchadora. Asi que no me subestimen."

The message says in English: "I am strong. I'm a fighter. Don't underestimate me."

This is not the first Demi Lovato nude photo scandal after there were images leaked online in August last year from an anonymous supplier who tried to sold them to the highest bidder.

According to Celebslam, the holder of the photographs has been negotiating with them as he told the website:

"We have nude/sexual photos of Demi Lovato and was wondering if you would like to buy them ... The girl in the middle row, last pic is our friend and is a girl Demi had a fling with for some time on and off," he wrote.

In the latest Demi Lovato nude photo scandal, the images show the former Disney princess in various states of undress as she cuddled with Wilmer Valderrama, her on-and-off boyfriend. Her tattoos are also prominently displayed, perhaps as a form of proof that it was really her in the photos.

There's also a topless photo of Demi Lovato but some websites have pointed out that it could be a fake because of the tattoo designs.

Prior to the Demi Lovato's nude photo scandal with Wilmer Valderrama ("That 70s Show"), the former "X Factor" judge also tweeted:

"Can't stand it when people are misunderstood cause of made up bs on sites that BLATANTLY LIE with NO truth 4 the sake of website hits. Smh," Lovato wrote, without alluding to the nude photo scandal that was to surface two days later after that tweet.