Attending the Vanity Fair and Serpentine Sackler Gallery VIP dinner, the 30-year-old chose a fun, feathered, flapper-style teal dress that featured a striking coral feathered skirt and gold embellishments around the neckline.
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The Matthew Williamson cocktail dress, which was teamed with teal heels and a beige clutch, showed off perfectly Pippa's toned figure, in particular drawing attention to her long tanned legs.
Kate Middleton's younger sister attended the star-studded party without her boyfriend Nico Jackson.
The couple have been dating since the start of the year, and the handsome stockbroker is regularly pictured by Pippa's side, most recently escorting her to the Boodles Boxing Ball at the weekend.
But she was by means short of company at the event, rubbing shoulders with the likes of Jemima Khan, Lord Maurice Saatchi and London Mayor Boris Johnson.
Jemima, who was a friend of the late Princess Diana, recently made headlines when she was romantically linked to Russell Brand. The couple seemingly confirmed their relationship as they stepped out together in New York less than two weeks ago.
That outing seemed to solve the mystery of who Russell had been referring to in an article written for The Guardian at the start of the month, when he revealed he was dating someone but would not reveal who.
"I'm not typically immune to the allure of objectified women, but I am presently beleaguered by a nerdish, whirling dervish, and am eschewing all others," he wrote.
Also in attendance at Tuesday's party was Roman Abramovich and his girlfriend Dasha Zhukova.
Dasha showed off her svelte figure in a black and red lace dress, five months after giving birth to their daughter Leah. The couple are also proud parents to three-year-old son Aaron, while Roman has five children from his marriage to Irina Vyacheslovovna Malandina.
From the days of penning a newsletter for the Middletons' family business Party Pieces, Pippa now has a number of columns, writing for Waitrose, The Telegraph, The Spectator and Vanity Fair.
Tuesday's dinner, which was hosted by Michael Bloomberg and Graydon Carter, was held to celebrate the new gallery launch in the building formerly known as The Magazine, in Kensington Gardens.