Miley Cyrus has been working out a lot lately, which is great -- except when her brains go to her biceps and she forgets basic things. You know, like skivvies. The starlet was recently photographed leaving her Pilates class in a sexy black dress ... and no underwear. Yikes!

Obviously, it takes a really pervy photographer to deliberately take a photo up anyone's skirt, but it's a practice that's been going on for a while, however inappropriate and unfortunate, and Cyrus is no dummy.

There's been rampant speculation about her attention-seeking antics lately. Despite tweeting earlier this week that she's thinking of leaving the Los Angeles scene to avoid paparazzi, she doesn't look displeased to have them photographing her outside her workout (or making the masses think she's engaged). It's also been rumored that the 'Party in the U.S.A.' singer has been self-harming, something her fellow Disney star Demi Lovato has also struggled with.

These are only the latest public missteps for the former 'Hannah Montana' starlet. She's been photographed leaving marijuana dispensaries, munching on a phallic birthday cake and even worrying boyfriend Liam Hemsworth that she's partying too hard. The behavior seems to be coming to a head -- or at least getting more attention -- now that Hemsworth's role in 'The Hunger Games' has shot him to superstardom. Could the rumors that Cyrus is scared of losing her Aussie beau to fame have a grain of truth?

In any case, this particular scenario is pretty ridic. Did she forget to throw a spare pair of pantaloons into her gym bag or did she plan on this? And uh, why is she so dressed up for a workout class? She couldn't have her assistant run and get her a pair of Fruit of the Looms to tide her over til she got home? You can check out the photos for yourself if that's your thing by clicking below -- be warned that the site is NSFW.