She was accompanied by her delicious boyfriend Nico Jackson, who had scrubbed up equally well in a tuxedo.
But it was Pippa's outfit that got us talking. The lacy black number looked almost sheer with glimpses of what look like flesh underneath... though it's actually down to a nude panel underneath.
What is sheer, however, is the skirt, allowing us to catch a glimpse of Pippa's perfect pins.
She teamed the beautiful dress with a sequinned black jacket and some simple black accessories. Perfs!
While sister Kate Middleton has to stay totally demure now she's a Duchess, we love that Pippa gets to be the racier little sister!
Pippa, 30, and banker Nico, 35, looked very comfortable in each other's company at the charity ball.
Rumour is that the couple may get engaged soon.
Hurry up Nico, we LOVE a rah wedding and can't wait to see what Pippa wears!
No doubt that butt will make another appearance.
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