01/29/2013 01:47 pm ET Updated Jan 30, 2013

Miley Cyrus Shows Off Slim Figure In Her 'Fiance' Jeans (PHOTOS)

Miley Cyrus has been going to Pilates classes religiously for months and we've been watching her shrink before our eyes.

On August 1, the 19-year-old singer was the victim of a "swatting" prank, but she didn't seem too rattled by it. The following day Miley was back to her regular schedule of tweeting photos of herself to her Twitter followers.

On Thursday, she posted a photo of herself, which showed off her ultra-toned abs and her fiance Liam Hemsworth's pants:

All the hours Miley has spent in Pilates class has paid off. Check out her dramatic transformation:

Miley Cyrus' Transformation

Subscribe to the Entertainment email.
Home to your favorite fan theories and the best movie recs.