Demi Lovato Heads Back To Work

'First day back to working,' singer tweets, without revealing details of project.

Demi Lovato is ready to work again. The star, who recently checked out of a treatment center after dealing with personal issues, tweeted on Tuesday that she's back to doing something, without revealing what her next big gig is.

"First day back to working. I can't wait to share with you guys what I'm doing today," she wrote on Twitter. "It's a big day for me. So excited! I love you all!!!"

While she didn't say what she was doing, she did reveal whom she was doing it with. "Wow what a very long but successful day today!! I'm SO blessed to have my friend @Alexavega with me ALL day for support!" she wrote, tweeting a photo of her and the "Spy Kids" star together. "Seriously so blessed for the friends in my life. Love them, AND love you guys too!!"

Her reps remained mum on what the project is when contacted by MTV News, but E! News reports that Disney reps confirmed that Lovato is not back on the "Sonny With a Chance" set.

Earlier this month, Lovato teased a new project in a similarly mysterious way, not getting into the specifics of what she was planning next. "I wanted to let you guys know that I'm excited to get back to work. I can't wait to tell you guys what the future holds," she said. "I can't wait to see you in person. I love you all and I couldn't have done this without you."

In addition to the new gig, Lovato recently revealed some new body art. "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 explained. "So I went ahead and I got a little heart tattoo on my wrist.

"It's something that my fans were actually drawing on their wrists while I was still in treatment. 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," Lovato added.