Demi Lovato "Let It Go" as she posted an Instagram photo wearing a thong bikini and showing off her curves during Brazil vacation. Her Twitter exchange with Ed Sheeran, meanwhile, hints about future collaboration.

With the sun behind her, soaking her with golden glow, Demi Lovato definitely "Let It Go" as the former Disney child star's photo was angled just right to get a peek of her bottom. The photo was captioned: "When in Brazil....#NEONLIGHTSTOURSA"

Meanwhile, Demi Lovato and British singer Ed Sheeran talked about a possible collaboration through a series of tweets starting April 29.

According to idolator.com, the former judge of "X Factor USA" started the ball rolling when she tweeted that her dream collaborations include Kelly Clarkson, Eminem, Marc Anthony, Christina Aguilera, Nicki Minaj, Drake, Lil Wayne, Macklemore and Ed Sheeran.

Her tweet got a quick reply when Ed Sheeran, tweeted back: "let's write a song then!"

To which, Demi Lovato replied: "I am SO down!!!!!!!"

Demi Lovato's "Let it Go" version from the Disney hit "Frozen" hit platinum in the United States. In the animated movie, the song was voiced by Tony award winner Idina Menzel, who also performed at the 2014 Academy Awards last month.

Demi Lovato's "Let it Go" version is made more significant because she was handpicked by composers Robert Lopez and Kristen Anderson-Lopez because of her rocky personal life. The pop singer was pretty open about her rehab stint and is trying to resume her career.

No stranger to controversy, Demi Lovato was the subject of a nude photo scandal rumor earlier this month along with boyfriend Wilmer Valderrama.

The "Skyscraper" singer posted a photo 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."