Miley Cyrus is all grown up and sexy and provocative and engaged and definitely not a child star. Did you hear that? If you didn’t hear that, she might scream it in your face. Which is effectively what she’s doing here.

Miley–with Australian fiance Liam Hemsworth in tow–attended a benefit in Hollywood last night celebrating Australians in film. To complement Liam’s relaxed style, Miley pretty much just wore a bra.

No, seriously:

Yes, apparently a skintight, semi-sheer Zimmermann micro-mini just didn’t communicate her adultness enough, so Miley needed to go partially topless. How about a close-up?

(Two thoughts: is the chain part of the bra-dress? Is “the Rachel” back?)

At this point, about 90% of Miley’s actions seem motivated by want of attention, whether it’s her sure-to-be-ill-fated engagement, jumping on the gluten-free bandwagon or stirring the pot of anorexia rumors by only wearing half-shirts whenever she’s photographed. We’re kind of surprised she hasn’t just shown up on the red carpet wearing a shredded “sexy nurse” Halloween costume and rolling around in front of the paparazzi screaming about how she’s a grown woman now and in control of her sexuality (or, perhaps, how she can’t be tamed). Which is to say: Taylor Momsen.

How long until Miley hits the red-carpet in a dress made of saran wrap?

(Photos via Wenn)