By Jennifer Davis
Updated Apr 23, 2018 @ 7:00 pm

It's an exciting day for the Middleton family! The Duke and Duchess of Cambridge welcomed their third child today, making Kate Middleton's little sister Pippa an aunt for the third time.

While Pippa wasn't at her sister's side for the birth of baby number three, she was spotted on her way to the gym in London on Monday in a very fitting ensemble.

For her outing, Pippa wore a chic baby blue coat—possibly a nod to her new nephew—over a black shirt and loose-fitting white pants. She finished off her look with round sunglasses, L.K. Bennett sandals, and a backpack slung over her shoulder.

Pippa Middleton - Lead

Over the weekend, The Sun reported that Pippa is expecting her first child with her husband James Matthews. The 34-year-old is allegedly three months along, and has begun to share the happy news with close friends and family. While the family has yet to comment, Pippa's loose-fitting ensemble could be hiding her growing baby bump.

Pippa and her husband James married last May St. Mark's Church in Englefield after dating for two years.