OK, she might not be a real-life princess like her sister, but Pippa Middleton was definitely the belle of her ball last night as she promoted her new book, Celebrate, instructing us all on how to throw a good party.
Pippa was stunning in a fitted, flirty dress tweed Stella McCartney dress featuring a black bibbed neckline, matched with suede black heels.
It was definitely higher up in the glamour stakes than the plum Roksanda Ilincic frock she'd chosen to promote her book in earlier that day, when she also chose to wear her hair in a slightly pared down version of her pretty half-up half-down 'do.
While she might have been secretly relieved that Duchess Kate didn't turn up and steal her thunder, she did get support from the rest of her family, posing for pics with brother James, and mum and dad, Carole and Michael.
What do you think of Pippa's promotional party dress? Let us know below, and see more of her style here: