Pippa and Nico, who is a stockbroker for Deutsche Bank, smiled and held hands as they walked to the Grosvenor House Hotel to join Prince Harry, Princess Beatrice, Princess Eugenie and Zara Phillips.
Author and columnist Pippa wore a striking floor-length dress by Catherine Deane which was made up of a black halter neck top and a bright tangerine skirt that showed off her glowing tan.
The 30-year-old accessorised her outfit with black peep toe shoes, a black clutch bag and wore her brunette locks in lose curls.
Nico, 35, looked dashing in a black velvet jacket, a black suit and bow tie.
Once inside the venue Pippa and Nico joined the likes of Prince Harry and his girlfriend Cressida Bonas and Princesses Beatrice and Eugenie who brought their respective boyfriends, Dave Clark and Jack Brooksbank.
In the past Pippa's sister Kate has stolen the show at the Boodles Boxing Ball.
Before her marriage to Prince William, when she was still known to the world as Kate Middleton, the Duchess of Cambridge attended the ball twice; once in 2008 wearing show-stopping pink gown and again in 2006 Kate turned heads in a sky blue dress.