Miley Cyrus
is definitely not a little girl anymore -- and went out of her way to prove it with one VERY sexy dress at Sunday night's Billboard Music Awards.

The 19-year-old hit the red carpet outside the MGM Grand in Las Vegas wearing nothing more than a white blazer, a necklace and a smile.

Cyrus revealing a ton of cleavage in the risque number, while also flaunting her short new 'do and nose ring.

The only thing that could have made this look any hotter: Boyfriend Liam Hemsworth, who was M.I.A. at the event.

What do you think of Miley's look? Too much or just hot enough? See more pics of Miley above and then sound off below!

And see more red carpet shots from the Billboard Music Awards here!

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