The sisters' former London bolthole is very plush.
Her husband, James Matthews, and adorable dog also joined in for the stroll.
Celebrity fad or parenting essential?
The Duchess of Cambridge's sister attended Princess Eugenie's wedding on Friday.
The Duchess of Cambridge's sister made a surprise appearance.
She could miss the second royal wedding.
From Stella McCartney to Pippa Middleton, keep up to date with the best celebrity fashion at Wimbledon 2018.
Since stepping onto the scene at the Duchess of Cambridge‘s 2011 nuptials, Pippa Middleton has become something of a national treasure.
The Duchess of Cambridge's sister served up some serious maternity inspiration at Wimbledon 2018.
See all of the new mom's best pregnancy looks. From Harper's BAZAAR