Prince Andrew's ex-wife Sarah Ferguson showed off her elegance as she beamed during stroll through London's Knightsbridge, seemingly celebrating a big family news.

The Duchess of York, who's set to become a grandmother for the fourth time next year, was all smiles as she walked through London's affluent Knightsbridge with a wheelie suitcase in tow.

It was Ferguson's first outing since her eldest daughter Princess Beatrice announced she's expecting her second child with husband Edoardo Mapelli Mozzi.

The Duchess of York, who's better known as Fergie, dazzled in a black skirt paired with a dark green zip-up sweatshirt.

She rocked an open blazer in the same shade over her hoodie and a pair of green and blue suede trainers. She wore her auburn hair loose and accessorised her outfit with a pair of dainty hoop earrings.

The Duchess of York released a heartwarming statement to expressed her "joy and excitement" as she's once again ready to take the role of a grandmother.

"Words can't quite express the joy and excitement I feel as you and Edo prepare to welcome another precious addition to your beautiful family," wrote Ferguson.