Whoa, where did those come from?!

Nicole Kidman stepped out in an uncharacteristically sexy dress while attending the Celebrate Life Ball in Melbourne, Australia on Thursday, hitting the red carpet in an extremely low-cut Prada gown that put her perky pair on display.

With her hair pulled to the side and back in a messy bun, the 46-year-old looked gorgeous alongside husband Keith Urban at the charity event -- where Nic showed off her fun side by posing for a few photos with a masquerade mask.

Kidman definitely stood out in the cleavage-baring, crystal-covered number, which also accentuated the actress' slim physique. She paired the look with some dangly diamond earrings that matched the embellishments on the dress.

There's no doubt that this is a gorgeous dress, we're just a little surprised to see it on Nicole!

What do you think of the look? Sound off below!

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