Kate Middleton Rocks Casual Stripes to Greet London Marathon Runners -- See Her Laid-Back Look!

Kate Middleton goes casual!

The Duchess of Cambridge, who normally sports chic dresses and trendy coats, opted for a more laid-back ensemble while greeting the #TeamHeadsTogether runners at Kensington Palace on Wednesday, ahead of the 2017 Virginia Money London Marathon.

WATCH: Kate Middleton Stuns in Alexander McQueen at Paris Gala

Middleton wore a white Luisa Spagoli Muvi sweater with red and black horizontal stripes ($280), which she paired with skinny jeans and white Superga tennis shoes ($65).

Though her outfit was more on the comfy side, her beauty look made up for it! She kept her brunette tresses down with a slight curl at the ends, and rocked a light pink pout and a touch of rosy blush.

Middleton was all smiles while chatting with some of the runners, who are in their final preparations for the big race on Sunday.

According to a post on Kensington Palace's official Instagram page, around 70 Royal Mail post-boxes "will be wrapped with @heads_together headbands on the @LondonMarathon route."

Meanwhile, Prince Harry opened the London Marathon Exposition with help from a 5-year-old girl, Melissa, who did the honors of cutting the red-and-white ribbon.

He also left a special message to the #TeamHeadsTogether runners on a whiteboard, which read, "Good luck guys! Smash it!"

WATCH: Kate Middleton Curtsies to the Queen in Perfect Easter Ensemble: Pics!

Over the weekend, Middleton went all out for her Easter Sunday look, chic in a high-collared ivory Catherine Walker dresscoat with a matching pillbox hat and heels.

Hear more on the ultra-classy ensemble (and see the pics!) in the video below.

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