Waist-ing away: Now rail thin Miley Cyrus reveals razor sharp collar bones as she steps out in crop top and hot pants

By Daily Mail Reporter

Miley Cyrus' shockingly skinny frame was all the more clear to see today as she headed out in Miami in the most revealing outfit yet of her East Coast trip.

The singer and actress displayed jutting collar bones and a minuscule waist, clad in a pair of denim hot pants and a tight black top.

With her hair pulled back into a tight bun, her rail thin look was further accentuated.

Stick thin: Miley Cyrus pictured leaving her Miami hotel today, revealing her jutting collar bones in a crop top

Miley, 19, was pictured leaving her South Beach hotel where she greeted teams of screaming fans who had assembled to meet her.

After arriving in Miami earlier this week, the former Hannah Montana star has been having trouble sleeping.

She has posted regular updates to her Twitter followers, explaining she is suffering from the three hour time difference between Florida and California.

Slim pickings: The singer and actress slipped into a pair of tiny hot pant, with her tight top revealing her tiny waist

In the spotlight: The former Hannah Montana star signed her autograph for fans

'When you feel so tired, but you can't sleep...Stuck in reverse, ' she tweeted, referencing the Coldplay track Fix You.

She went on: 'Coldplay is lulling to sleep tonight. 230 CAN'T SLEEP.'

Miley's newly trimmed down figure is the result of a strict exercise regime.

She is regularly seen attending Pilates classes - and sometimes twice a day.

And while all that hard work certainly seems to have paid off, Miley Cyrus may be in danger of taking her diet plan too far.

Media frenzy: The 19-year-old star was swamped by fans and photographers as she headed out for the day

While she has defended herself against accusations of an eating disorder she has vociferously promoted her 'gluten-free diet' which has in itself attracted criticism.

Recently she took to her Twitter page to debunk the rumours, claiming her weight loss was due to a dietary allergy.

Miley tweeted: 'For everyone calling me anorexic, I have a gluten and lactose allergy. It's not about weight it's about health. Gluten is crapppp anyway!'

And she even told one fan: 'Everyone should try no gluten for a week! The change in your skin, physical and mental health is amazing. You won't go back!'