While the Duke and Duchess of Cambridge were at the event - along with the Queen, Prince Charles and Camilla, Duchess of Cornwall - the Duke and Duchess of Sussex were not in attendance.
Meghan Markle spoke at an event very close to Prince Harry's heart on Tuesday evening. The fund was set up in memory of one of Prince William and Prince Harry's friends who died in a auto crash back in 2002.
"She wants to be on hand to help Meghan and Harry with the baby".
Although the royals weren't photographed at the event, we do know Markle read a poem-"Our Deepest Fear" by Marianne Williamson-during the service, while Harry gave a speech.
"Meghan "hides" from Kate by dropping her head so her hair masks her face from Kate while she laughs behind it".
The former first lady of the US was in London recently, where she met with Duchess of Sussex, Meghan Markle.
While Meghan and Harry attended the carol service, Kate also kept busy.
The rumours came about after Meghan, 37, and Harry, 34, announced they are moving to Frogmore Cottage, on the Windsor Castle estate.
Needless to say, it's been a turbulent few months for the "Fab Four".
As speculation about the growing rift between the Cambridges and Sussexes gained traction this week, Kensington Palace took the extraordinary step of issuing a statement addressing the drama.
Even Kate brushed off the feud claims last week, revealing she was extremely excited for her three children to have a little cousin.
"As my wife said many years ago when working on menstrual health and health education, this is not about periods but potential", he said, referencing Meghan's visit to India with World Vision in January 2017 to highlight the importance of breaking the stigma surrounding menstruation.