This is very demure and ladylike, like the dress version of something your grandmother would drape over her pianoforte ...EXCEPT I CAN TOTALLY SEE HER NIPPLES. Full on nips ahoy.
I admit, I've never thought of Kidman as a Nipple Flasher, which makes me think...is it possible she didn't KNOW? But! That dress is fully bra-able. There is no reason not to just wear standard issue undies with this, right? Although maybe she thought those two flowers were more Strategically Placed than they actually are. THOSE FLOWERS HAVE BETRAYED YOU, NICOLE. They know what they did.
I like to think that this is where The Betrayal of the Flowers was discovered. That Keith Urban, such a gentleman.