Miley Cyrus in Zimmerman

We've all see the pics of Miley Cyrus leaving countless Pilates classes over the last few months, and it looks like all those toning sessions have more than done the job, as the starlet showed off an incredibly slim, toned body last night at the Australians In Film Breakthrough Awards.

Miley was there to show support for her Aussie fiance Liam Hemsworth, who won the Breakthrough Award at the ceremony, but she stole the show in exactly the kind of dress that only a fitness-obsessed 19-year-old can get away with!

Her tiny Zimmermann frock featured sheer sleeves, bra cups, a cutout below the chest and a body con mini skirt. We have to applaud her for choosing an Aussie designer for an event celebrating Australians - very appropriate!

It's also great to see a young star dressing her age and having a bit of fun with clothes. By keeping the hair sleek, the makeup soft and the shoes slightly chunky, Miley keeps this super-sexy dress from looking too slutty!