Pregnant Kate Middleton Glows in Adorable Navy Shift Dress

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It's safe to say Kate Middleton has this whole maternity dressing thing down.

The Duchess of Cambridge looked as adorable as ever in a chic navy blue Madderson London shift dress during her visit to Barlby Primary School in London on Thursday. And -- scandal! -- Kate also showed a little bit of leg with the over-the-knee style, which she covered up with black tights.

The already sold-out $683 frock (which crashed the Madderson website shortly after she was spotted in it) featured pink tweed embellishments on the pockets and the hem to keep it interesting, and she finished up the look with her trusty black suede heels.

PHOTOS: Kate Middleton's Best Looks

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Though who can stare at the dress when her shiny, full locks are on display?

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The stylish royal, 33, is at least five months along, announcing her second pregnancy in September.

Kate was on hand Thursday to officially name the Clore Art Room at the Barlby School, and also met with teachers and counselors on the importance of art therapy in schools. Kensington Palace's new Instagram page -- which they just started on Wednesday -- posted this cute video of students welcoming Kate with lots of excited applause.

For her part, Kate also looked ecstatic to meet the young children, who presented her with some of their unique artwork.

Behold, a chair decorated with stamps.

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Kate's been spare with her public appearances lately due to her pregnancy, but she did meet the members of One Direction in November, when cameras captured her with a leopard jacket-wearing Harry Styles.

Watch below!