May 17, 2011 18:01 GMT  ·  By

There was a time when Disney star Demi Lovato was so insecure of her body that she would starve and cut herself because she needed to punish herself for not meeting standards. Today, there’s no sign of that girl anymore – and Demi is happy with herself and her body.

In fact, she’s so happy with how she looks that she’s even taken to Twitter to show off her summer-ready body.

Hours ago, Demi went on Twitter with a picture of herself in a two-piece white swimsuit, proving that, ever since leaving rehab, she’s been taking good care of herself, eating right and working out regularly.

“I’ve been working so hard to get healthy and fit.. I can’t believe I’m about to do this but I’m so excited.. Here’s ...” Demi says in a tweet accompanying the photo.

She then goes on to say that, until recently, she didn’t actually believe she would ever have the confidence required to do that, post a revealing photo of herself for her 3.1+ million fans and the world to see.

“I never thought I’d ever feel confident enough to ever to that. I’m excited how far I’ve come since being completely ashamed of my body..” she muses.

As we also reported a while back, Demi is now working to make other girls and women with body image issues know that they should seek help if their behavior becomes self-destructive, as was the case with her.

“I want any girl/guy out there who struggles with body image or confidence to know that it IS possible to find peace with yourself,” the star says.

“It hasn’t been easy, but it starts with a commitment to yourself.. Your mind.. And your soul. And trust me, I’m still working at it!! Haha,” Demi adds.

In a recent interview on the topic of her time in rehab, Demi revealed she developed an eating disorder when she was just 11. Throughout the years, she struggled with anorexia and bulimia – and even began cutting herself to cope with the pressure.