It might be a strictly private, family affair.
But the Duke and Duchess of Cambridge still made sure to give royal fans a glimpse of their growing Prince George as they arrived at St James' Palace for the Royal Christening this afternoon.
Showing off her incredible post-royal baby weight loss once again, Kate Middleton was picture-perfect in a well-tailored, long-sleeved cream coat-dress by McQueen with an oversized ruffle.
Starting at the neckline and working down to a ruffled, peplum style at her waist, Kate's classic, pristine outfit also featured a full, A-line style skirt.
Making sure to keep her accessories to a strict minimum, Kate wore her long brunette locks half-pulled back behind a matching fascinator by milliner Jane Taylor, complete with corsage and netted detailing.
The Duchess rounded off her sophisticated, classic look for the occasion with nude pump heels and her trademark eyeliner, with a hint of gloss on her lips.
Kate beamed as Prince William headed inside cradling their son, who was showing off the replica of the original Royal Christening gown which hit headlines this week.
[LIVE: The Royal Christening at St James' Palace]
[Prince George's Royal Christening in pictures]
[Original Royal Christening gown dressmaker revealed]
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It was revealed that Scottish dressmaker Janet Sutherland was behind the handcrafted original gown, which was worn by 60 royal babies following her commission in 1841.
But after the Queen deemed the historic robe too fragile in 2003, Prince George's replica was crafted by the Queen's couturier, Angela Kelly.
Kate's choice of McQueen for the Royal Christening today will come as no surprise to fashion fans; with the Duchess regularly plumping for the fashion house when it comes to official outings.
She famously wore a silk and lace Sarah Burton for Alexander McQueen wedding dress for her nuptials and opted for the designer once again during the Diamond Jubilee celebrations - wowing in pillarbox-red.