Duchess Kate stuns in Alexander McQueen for Prince Louis' christening

She's back! After a month-long hiatus, Duchess Kate stepped out for her newborn son's christening looking as stunning as ever in Alexander McQueen.

The proud mom was seen walking into St. James' Palace in London wearing a white dress with structured shoulder detailing by her favorite British designer. She paired the dress with a Jane Taylor hat and a dazzling pair of pearl earrings.

As for her hair and makeup, Kate styled her tresses in a low chignon bun while rocking a daytime-appropriate smoky eyeshadow on her lids, a nude color on her lips and some blush on her cheeks.

The 36-year-old royal has worn similar Alexander McQueen looks in past years for the christenings of her other children Prince George and Princess Charlotte. For George's baptism in 2013, she wore a ruffled yellow look and for Charlotte's in 2015 she donned a white coat dress.

See photos from Charlotte's 2015 christening:

Kate and William's immediate family (with the exception of Queen Elizabeth and Prince Philip) attended Louis' christening on Monday. The Duke and Duchess of Sussex walked in shortly after Kate and Wills, with the duchess looking gorgeous in Ralph Lauren. Kate's little sister Pippa Middleton looked beautiful in a blue, bespoke Alessandra Rich number.

For more on the royal christening, watch the video above.