The 34-year-old stepped out alongside husband James Matthews for the Prince Louis of Cambridge's baptism at Chapel Royal at St. James' Palace in a powder blue Alessandra Rich dress and matching fascinator.
The sister of the Duchess of Cambridge paired the look with Jimmy Choo heels and a satin clutch.
Pippa recently opened up about her pregnancy in a column for U.K. magazine Waitrose Kitchen.
“I was lucky to pass the 12-week scan without suffering from morning sickness. That meant I was able to carry on as normal,” Pippa wrote, as reported by Hello!.