Kate Middleton enjoyed a low-key outing on Friday

The 35-year-old Duchess of Cambridge was spotted looking cozy at King's Cross St. Pancras Station on Friday morning.

Middleton, who is pregnant with her third child, kept warm in a $169 black-and-white plaid Zara coat, which she wore over a gray turtleneck sweater, black faded jeans and black ankle boots. She clutched a black leather Mulberry purse, her hair was held back in a low ponytail and she wore minimal makeup. 

Middleton had a busy week, gardening with local school children and visiting The Foundling Museum in London.