Demi Lovato just surprised her fans with two new photos on Instagram. In the snaps, the singer posed in nothing but a white T-shirt.

In the first photo, Lovato is staring straight into the camera while her head is tilted to the right. She is wearing a white V-neck T-shirt, but she opted to roll it up under her breasts to show off her toned abs.

Lovato’s tattoo, which is inked on the right side of her ribs, is also showing. Even though the singer’s lower body is now shown in the photo, the snap reveals that she’s wearing what looks like thongs.

In the second picture, Lovato has her head turned toward the camera while her entire body is facing her right side. She is still wearing the white T-shirt, but it is covering her upper body. Lovato’s toned bum is accentuated by the white T-shirt that she has on.

Lovato did not reveal what the photos were for, but she credited photographer Angelo Kritikos for taking them. After uploading the two snaps, Lovato received positive comments from her followers and some people from the modeling and fashion industry.

Supermodel Ashley Graham commented on Lovato's photos by saying, “Well damn!” Fellow supermodel Iskra wrote, “Natural beauty.”

In related news, Lovato also made headlines this week after she reacted to Shawn Mendes’ new Calvin Klein photos. On Wednesday, Mendes shared three photos of himself wearing his Calvin Klein underwear.

In the first photo, Mendes is wearing nothing but his blue and white Calvin Klein underwear. In the second snap, he’s wearing a white Calvin Klein shirt and underwear. In the third photo, Mendes is wearing his jeans jacket and pants while showing off the label of his Calvin Klein brief.

After seeing the three photos, Lovato commented on Mendes’ post with three fire emojis. Other artists couldn’t also help but praise Mendes for his beautiful campaign for the brand.

“I would have loved to comment on this, but my Fruit of the Loom contract prevents me from doing so,” joked John Mayer. “That’s the last time I’ll loan you my Calvins,” Ryan Tedder wrote.

Demi Lovato Demi Lovato attends the 2017 American Music Awards at Microsoft Theater on November 19, 2017, in Los Angeles, California. Neilson Barnard/Getty Images