However, Her Majesty was joined for the day of RAF Centenary celebrations by the rest of the Royal Family.
She wore an olive green shift dress by American designer Ralph Lauren Monday, accessorizing the frock with a matching hat from Stephen Jones during the ceremony at St. James' Palace Chapel Royal in London, where Meghan was baptized earlier this year.
Noticeably absent from the event were Queen Elizabeth and Prince Philip, who were reportedly unable to attend the christening due to scheduling conflicts.
While many expected Prince Charles to walk his mother to his seat, the 92-year-old made her way down the aisle on her own, just behind Charles and Camilla.
The Duke and Duchess of Sussex arrived at the Abbey together with the Duke and Duchess of Cambridge, with the Princes in their uniforms and Kate Middleton again sporting Alexander McQueen. William was the fourth successive generation of the monarchy to become an RAF pilot.
The newlyweds greeted the Archbishop of Canterbury, Justin Welby, ahead of the christening service and Meghan, who shot to fame as Rachel Zane in legal drama Suits, was caught on camera giggling as she greeted the man who officiated her wedding in May.
After the service, the monarch, accompanied by Prince Charles, will present a new Queen's Colour to the RAF on the forecourt of Buckingham Palace and make a short speech.
- Raheem Sterling, England on collision course with Belgium in World Cup final
- Guitar man Kevin Anderson wants rhythm not blues against Roger Federer
- Cherchesov promises Russian comeback in Qatar
- George Clooney reportedly hurt in motorcycle crash in Italy
- UK Foreign Minister QUITS, Theresa May Facing REVOLT — BREXIT BREAKDOWN
- Prince Louis's six godparents revealed ahead of christening
- Modric reveals Croatia biggest concern ahead of England clash
- Multi-vehicle crash kills five and injures four in New Castle County
- YouTube aims to crack down on fake news
- Out of 13 Rescued from Flooded Cave in Thailand