Miley Cyrus knows how to turn on the mystery! The 'Can't Be Tamed' singer and former 'Hannah Montana' star tantalized her followers with a somewhat cryptic tweet on Monday. "Doctor's appointment and then off to work on my newest project. Can't wait til I can share it with y'all!" Cyrus wrote.

Perhaps the new project is a charitable venture. Cyrus has been spending a lot of her time doing good deeds, notably for Kids Kicking Cancer and the Starkey Hearing Foundation in Haiti.

While she hasn't mentioned whether the endeavor is musical or a film, maybe she's referring to her God-themed comedy -- or maybe a new TV gig? She does miss 'Hannah Montana'!

Whatever the new project is, hopefully it's not too racy. Experts agreed that her sexy image did more damage than good for her career--but it didn't harm her bank account too much, because she still made it to the number 2 spot on People's Richest Teen Celebs list.