Popsugar Fashion Celebrity Fashion Kate Middleton at Trooping the Colour 2018 The Duchess of Cambridge's Dress Paid Homage to Prince Louis in the Sweetest Way 13 June 2018 by Morgane Le Caer First Published: 9 June 2018 Image Source: Getty On June 9, the Duchess of Cambridge joined the Duchess of Cornwall and the rest of the royal family — including the glowing newlyweds Prince Harry and Meghan Markle — for a fun day in London. The Duchess of Cambridge, who's been attending Trooping the Colour since 2011, once again stunned in a gorgeous baby blue dress by Alexander McQueen, which she accessorised with a hat by Juliette Botterill and Kiki McDonough jewels. The celebration of the queen's official birthday marks Kate's first official appearance since Prince Harry and Meghan Markle's wedding — where she wore another stunning Alexander McQueen ensemble — and her second one since the birth of Prince Louis. As we patiently wait to see what she'll choose to wear for his upcoming christening, read on to get a closer look at her baby blue dress, which we can't help but think was a sweet homage to her third child. Related: Meghan Markle's Dress Was So Beautiful, No One Noticed It Broke Royal Protocol Image Source: Getty / Mike Marsland 1 / 13 Image Source: Getty / Chris Jackson 2 / 13 Image Source: Getty / Samir Hussein 3 / 13 Image Source: Getty / Chris Jackson 4 / 13 Image Source: Getty / Chris Jackson 5 / 13 Image Source: Getty / Chris Jackson 6 / 13 Image Source: Getty / Chris Jackson 7 / 13 Image Source: Getty / Karwai Tang 8 / 13 Image Source: Getty / Chris Jackson 9 / 13 Image Source: Getty / Karwai Tang 10 / 13 Image Source: Getty / Simon James 11 / 13 Image Source: Getty / Chris Jackson 12 / 13 Image Source: Getty / Chris Jackson 13 / 13 Celebrity FashionSummer FashionThe RoyalsJuliette BotterillKiki McDonoughThe British RoyalsDressesSummerAlexander McQueenDress