Kylie Jenner and Demi Lovato both sizzled online as they showed off their sexy bikini bodies. Jenner, 17, and Lovato, 22, both displayed their shapely figures as they shared their bikini clad photos on Instagram during the weekend.

Lovato posted an uncaptioned photo of herself smiling and hugging her little white dog, Buddy, while showing off her toned bod. For the photo, Lovato wore a lavender bandeau top paired with neon lime bottoms.

Earlier that day, the "Heart Attack" hit maker tweeted: "I want success more than I want sleep. And that's why nothing stops me from killing the gym on Saturday mornings." In the said photo, Lovato showed her backside revealing her favorite asset.

E! News revealed that Lovato has been working with an "amazing trainer" who motivates her through cycling exercises and by sticking to a focused meal plan. In the January issue of Allure, Demi, who has lost weight in recent months, divulged her favourite body part. "It's my butt. I love my butt," she said. "Hopefully it stays that way, because this thing isn't going anywhere."

In the interview, Lovato credited Kylie Jenner's half-sister Kim Kardashian for helping her appreciate her figure. Meanwhile, Klie Jenner also posted steamy photos of herself clad in a black cage-style bikini while frolicking in the sun at the $18 million mansion of her half-sister Kourtney Kardashian and Scott Disick.

Jenner took a selfie as she sat back in a lounge chair and pulling up her bikini bottoms, emphasizing her small waist and curvy figure. She captioned the photo: "Thanks @goldteethgod for the necklace of my G Wagon," referring to the necklace she was wearing in the photo.

Jenner also shared a full-length photo of herself on Instagram and wrote, "Ok, I'm done." Last week, Jenner posted a photo of herself in a bondage-style bikini. It turns out that the black-and-white photos were for an upcoming photo shoot.