Casual Kate! See a Low-Key Princess Kate in Leggings

02/21/2016 AT 07:00 AM EST

Princess Kate isn't like a regular royal, she's a cool royal.

The trendsetter pulled a fashion switcheroo on Wednesday when she changed from a professional look to casual athleisure midway through the day.

In the morning, Kate hosted Huffington Post UK at Kensington Palace where she served as a guest editor for the outlet to promote Children's Mental Health week. She paired a ladylike white Reiss top with a black and white Dolce & Gabbana skirt for her foray into blogging.

Casual Kate! See a Low-Key Princess Kate in Leggings| The British Royals, The Royals, Kate Middleton, Prince William

Princess Kate

TOPSTAR

Later that afternoon, however (with flawless blowout still intact), Kate, 34, was spotted embarking on some retail therapy during a stop at the Lululemon store on Kings Road in London. For her first-ever trip to the popular athletic-wear shop, she wore black yoga pants, a black coat and black scarf with her well-worn running shoes.



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Kate has supported mental health charities since her 2011 marriage to Prince William, and recently teamed up with Huffington Post UK to launch Young Minds Matter, an initiative exploring the causes and treatment of children's mental health problems.



Casual Kate! See a Low-Key Princess Kate in Leggings| The British Royals, The Royals, Kate Middleton, Prince William

Princess Kate

Chris Jackson / Getty

"We hope to encourage George and Charlotte to speak about their feelings, and to give them the tools and sensitivity to be supportive peers to their friends as they get older," Kate wrote in a blog post on the site. "We know there is no shame in a young child struggling with their emotions or suffering from a mental illness."

With reporting by MONIQUE JESSEN
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