TCAA/ZDS/Tony Clark/WENN 1 / 16
TCAA/ZDS/Tony Clark/WENN 1 / 16

How low can she go?!

Pippa Middleton, who knows a thing or two about stealing the spotlight, stepped out in her sexiest look yet.

PHOTOS: Pippa's best style moments

The 28-year-old brunette attended the Boodles Boxing Ball on Saturday night in a stunning red satin dress with a plunging neckline. She accessorized with gold heels and a matching clutch.

PHOTOS: Best Dressed British Stars

The charity event drew several British royals and celebs including Princesses Beatrice and Eugenie, Prince Harry's ex-girlfriend Chelsy Davy and former Spice Girl Geri Halliwell.

PHOTOS: Hot Brits!

Middleton, who was escorted by her boyfriend Alex Loudon, was caught smooching the financier, 31, by the Daily Mail outside the Park Plaza Hotel in London around 4:30 a.m.

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