The real stars of the show though, as always, were The Duke and Duchess of Cambridge, Prince Harry and Meghan Markle, now fondly dubbed The Awesome Foursome. But her white and navy blue ensemble wasn't just a chic fashion choice for the event she attended with her fiancé Prince Harry and future siblings-in-law, Prince William and the Duchess of Cambridge.
Although to the untrained eye, it seems impossible to tell them apart, Meghan's pair are believed to be from Spanish designer and Sex and the City fave, Manolo Blahnik, after she wore a very similar black pair of Manolos on another royal outing. This isn't the first time she's paid homage to her late mother-in-law, who's style-icon status is still strong to this day. "As we give thanks for our rich diversity and for our common humanity, let us pray together for peace and unity, and that we may offer one another mutual friendship and support".
In her message to the gathering, Queen Elizabeth praised the value of "exchanging ideas and seeing life from other perspectives".
The queen wore a gorgeous burgundy coat and hat to the Commonwealth services at Westminster.
How to dress up your International Women's Day outfit
The day is often marked around the world with performances, talks, rallies, networking events, conferences and marches . International Women's Day is a collective day of global celebration and a call for gender parity.
Fiance Prince Harry was with Markle through the training, which was conducted in the Herefordshire, England, countryside by the elite British army unit, the Express reported.
She may be American, but Meghan Markle knows the British national anthem!
Chris Jackson/Getty Images Meghan Markle attends the Christmas Day service at the Church of St. Mary Magdalene on December 25, 2017 in King's Lynn, England.