The corseted top and sateen bow were super-pretty, the bold lip and old school Hollywood Veronica Lake-style waves were stunning, and the dramatic dress certainly succeeded in stealing the limelight from "The Rob and Kristen show".
The couple were reunited on the red carpet, and Robert Pattinson himself was no wallflower in a green Gucci suit.
Kristen spent time signing autographs for fans who'd arrived in their thousands at the Nokia Theatre in LA, and, when she turned around, the gown was just as revealing from behind.
Anybody ever heard of layering?
What do you think of Kristen's flashing frock? Too much on show? Or show-stopping?
See all the pics from The Twilight Saga: Breaking Dawn Part 2 premiere here: