Demi Lovato Bares Flat Abs in New Selfie: 'I've Been Working Really Hard'

Demi Lovato's latest selfie proves that hard works pays off!

The 24-year-old singer shared a mirror selfie to Instagram Tuesday, showing off her flat, toned abs. In her caption, she explained to her followers that although she's normally insecure about sharing pics of her entire tummy, she's "feeling herself" and all the hard work she's put in to her diet and exercise routine lately.

β€œI rarely post pics with my belly button showing because I’m normally insecure about showing my full stomach but I’ve been working really hard and thanks to [nutritionist Daniel Leith] and his yummy food with [FitnessVT Nutrition] I’ve been seeing progress so I thought I’d post this cause I’m feeling myself right now!!” she wrote beneath the sexy snap.

She also went on to thank her trainers, Jason Borba and Kim Glass, as well as her gym, Unbreakable Performance.

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Lovato regularly posts workout videos on her Instagram account, including her boxing and jiu jitsu lessons. The "Sorry Not Sorry" singer has battled with bulimia, bipolar disorder and substance abuse over the past several years, and told Fitness Magazine that fitness is an extremely important part of her recovery.

β€œExercising has been so important for my recovery, both physically and mentally," she said. β€œOn show days I count my concert as a workout, but on my off days I try to work out once in the morning and again at night. It can be a lot between performing and traveling, so I'm careful not to push myself too hard.”

"I realized I'd rather be strong and happy than be what society thinks is thin and perfect and be miserable,” Lovato continued. β€œI know my past will always be a part of me, but I don't want it to define me. Right now I'm excited to live in the present and looking forward to the future."

She even shared her daily diet with Women's Health UK, which includes a lot of protein and veggies.

For breakfast, Lovato enjoys oatmeal and egg-white pancakes with applesauce and fruit. Lunch always includes a lean protein, like a turkey wrap or a chicken fajita to keep her metabolism going strong and to help her avoid the post-lunch slump!

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Dinners vary from a chicken stir-fry to salmon with asparagus. Processed foods have no place in Lovato's diet, and neither does alcohol. She eats several small meals a day to keep her full and energized.