The monarch was due to return to London on Monday before a busy schedule of events including a meeting with US President Donald Trump on Friday at her Windsor Castle home.
However, Prince Harry's bride had no brooch or bejewelled accessory in sight on her dress - the only member of the royal family to not wear one to the ceremony.
Meghan wore a long-sleeved, full-skirted black Dior dress with a bateau neckline, topped off with a Stephen Jones fascinator.
His Royal Highness Prince Louis Arthur Charles of Cambridge may be only 2 months old, but it looks as though he's already living like a royal a.k.a. receiving gifts that cost thousands of dollars.
The Duke of Sussex is understood to have bought the 1926 A.A. Milne book - of which 30,000 were printed in the first run - from Peter Harrington in London.
Catherine's father Michael Middleton, as well as her pregnant sister Pippa and her husband James Matthews, were also amongst those invited to the service.
Prince William served a stint in the RAF Search and Rescue service in North Wales, and Prince Harry also briefly took part at RAF Shawbury.
Eager to make the most of her moment in the spotlight, she even turned back on the hospital steps to offer a final greeting to the crowds.
In a video, the Duke of Cambridge can be seen sitting alongside wife Kate Middleton-who broke her maternity leave for a surprise appearance at the event.
Overnight, the newest member of the British Royal Family, Prince Louis, was christened.
Charlotte, 3, was dressed in a blue floral frock, wearing her hair parted in the middle the princess wore a blue headband that had a bow attached at the top.
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