What does Demi Lovato have up her sleeve?

We'll know in good time. But for now, the singer/actress tweeted out a photo teasing a super-secret special project she is working on with MTV. The photo features her wrists, emblazoned with her tattoos that read "Stay Strong." The picture offers up a couple of hints: the date "3.6.2012" and the hashtag #staystrong.

"Lovatics-I wanted to tell you FIRST about a special I worked on with @MTV," she tweeted. "It premieres March 6th at 10pm!! #staystrong."

Lovato first showed off the ink back in March 2011, just two months after she left an Illinois treatment center to deal with personal issues including an eating disorder and cutting.

"The journey that I went through and the support of my fans was so meaningful to me that I wanted to thank my fans in a way that I know can never be forgotten," the singer said in 2011.

"It's something that my fans were actually drawing on their wrists while I was still in treatment," she explained about the significance of her tattoos. "Some people even got tattoos of it, so I wanted to show you guys that I will never forget the support that you guys gave me."

Since returning to the spotlight, she has focused on her music career, including her 2011 album, Unbroken, which launched her empowering hit single "Skyscraper." Her next single is "Give Your Heart a Break."

Lovato has become a voice for young people struggling with personal issues. In December, she visited and spoke to patients at the Timberline Knolls Center, where she had received treatment.

"To be able to share my story and let them know that it gets easier ... Life is beautiful ... you are worthy of it," Lovato said. "Please say a prayer for all of those struggling with eating disorders, self-harm, mood disorders and substance abuse."

Tune in to MTV on Tuesday, March 6, at 10 p.m. for Demi Lovato's top-secret special!