It鈥檚 been a busy week for Kate Middleton. She already stepped out nailing a (on theme) casual outfit and looking pretty in pink at various events, and she just made a major case for the little white dress during a day at the Royal Ascot races in her latest summery look.

The mother of Prince George, three, and Princess Charlotte, two, joined her husband, Prince William, at the horserace Tuesday wearing a lacy number. She tapped her go-to designer Sarah Burton for Alexander McQueen (whom she just wore for her little sister Pippa鈥檚 wedding last month).

The Duchess of Cambridge kept it classy in the knee-length, lace dress with long sleeves and a high neck. (Cue major flashbacks to her own dreamy wedding-day dress.) With its collar detail, waistband, and lace peplum, the Duchess didn鈥檛 need much in the way of accessories. In traditional British fashion, she added a matching white hat with floral details. A pair of pearl drop earrings and a nude clutch and heels completed her look.

Yesterday was also a reportedly sweltering day in London, so the lacy, short white number was perfect for the formal, outdoor summer affair. Leave it to the impeccably styled Middleton to always nail the right look.

What do you think of Kate鈥檚 latest summer look? Let us know @BritandCo!

(Photos via John Phillips, Charlie Crowhurst, Alan Crowhurst/Getty)