Demi Lovato is feeling more confident than ever! The singer showed off her bikini-clad figure in a shot she shared on both Instagram and Twitter.

"2014… feeling healthy, feeling rested.. Y'all ain't ready! #NEONLIGHTSTOUR" she captioned the photo, which shows the former 'X Factor' judge wearing a skimpy black bikini, relaxing in front of the water.

Lovato has been outspoken about her struggles with an eating disorder and drug abuse in the past.

"I couldn’t go without 30 minutes to an hour without cocaine and I’d bring it on airplanes,” Lovato revealed in an interview last month. “I would smuggle it basically and just wait until everyone in first class went to sleep and I would just do it right there, or I’d sneak to the bathroom and I’d do it.”

The 21-year-old singer, who also struggled with bulimia, bipolar disorder, and self-harm, recently wrote a memoir, "Staying Strong: 365 Days a Year," about her health difficulties and time spent in treatment. She has since become a role model for people everywhere as she strives to make a difference in the world and encourage others to seek help if they're struggling with similar issues.