Princess Charlotte is already an experienced bridesmaid - having participated in two high-profile weddings already, including Pippa Middleton's wedding to James Matthews and Prince Harry and Meghan Markle's nuptials.
The bride-to-be announced her engagement to Brooksbank on January 22, after the nightclub manager proposed to her during a trip to Nicaragua.
'I was over the moon,' Eugenie told the BBC. '[It was a] complete surprise. But it was the perfect moment, we couldn't be happier.'
Eugenie and Jack met seven years ago at the Verbier ski resort in Switzerland, and recently moved in to Kensington Palace, right next door to the newlywed Duke and Duchess of Sussex.