Demi Lovato looked hotter than ever at a NY pool party on Wednesday night to celebrate her new single ‘Cool for the Summer’.

Demi shared a selfie to Instagram from the event, dressed in a racy cut-out bikini and sarong, captioned: “#COOLFORTHESUMMER.” Cool indeed!

Showing off her toned abs and slender frame, the singer looked miles different to the fresh-faced preppy Disney star she once was. Check out the flashback pic below with Selena Gomez in 2008…

Yep, it looks like Demi’s come a long way from the tortured former child star who spent three-months in a treatment centre for bulimia, self-harm and drug abuse back in 2010.

But after a near relapse in 2014, Demi said it was her long-time boyfriend Wilmer Valderrama, 34, who helped get her back on track.

“I almost went back to rehab for my eating disorder last summer,” she said at the time. “‘I was obsessing over food and terrified of it at the same time. Wilmer noticed and called me out on it, which was a relief.”

Keep up the positive vibes, Demi! Oh and the fitspo Insta-snaps too.