Eugenie looked stunning in a black maxi dress which she wore with a glamorous long red coat.
The royal, who is eleventh in line to the throne, completed her outfit with black heels and a clutch bag.
She straightened her glossy brunette hair which she wore around her shoulders.
Meanwhile, Jack looked smart in a blue suit.
The new parents, who tied the knot in 2018, grinned as they posed for a picture at the charity event.
They were no doubt pleased to have a rare night out following the arrival of their first child in February.
The family-of-three have been living at Prince Harry and Meghan Markle’s former Windsor residence Frogmore Cottage.
Eugenie’s parents Prince Andrew and Sarah Ferguson live nearby at Royal Lodge.
The Duke and Duchess of York are likely to be keen for babysitting duties.
Sarah revealed their excitement at becoming grandparents in an Instagram post after August was born.
She said: “As Grandparents, The Duke and I are thrilled and blessed at the arrival of our grandson August Philip Hawke Brooksbank.
“He is a beautiful blessing and a bringer of such love and joy to all our Family.
“I am so proud of Jack and Eugenie, they are and will be wonderful parents.”
Last month, Eugenie and Jack were spotted arriving at Balmoral with baby August to join the Queen during her annual summer holiday.
Sarah and Andrew were also seen arriving for the Royal Family’s traditional break in the Scottish Highlands.
Later this year, Eugenie’s sister Princess Beatrice is expecting her first child with Edoardo Mapelli Mozzi.
The sisters will be delighted to have their children so close together in age and to share the experience of being first-time mothers.
SOURCE: EXPRESS CO UK