New father James, 43, pushed their six-day-old baby boy in a pram as they headed out for a stroll near their £17million west London home yesterday.
The couple also brought along their two dogs, a Labrador and a Cocker Spaniel named Rafa, on the family outing in leafy Chelsea.
Pippa, 35, welcomed a baby boy weighing 8lb and 9oz at the private Lindo Wing, at St Mary's Hospital, Paddington, last week, but his name has not yet been revealed.
Despite being just a few days into parenthood, the couple, who tied the knot in May last year appeared perfectly at ease as they joined Londoners soaking up the autumn sunshine.
They chatted happily as they ambled along the pavement, with Pippa at one point taking hold of her husband's arm in a sweet show of affection.
The new mother looked laid-back in a £350 day dress with ruffle detailing by favourite designer Kate Spade, which she wore under a long navy cardigan.