The visit marks their first trip back to England as a family since making their royal exit in January 2020.
Meghan Markle and Prince Harry stepped out for the kickoff of Queen Elizabeth's Platinum Jubilee celebration.
Their arrival marks the first time their daughter will meet the monarch since being born in Santa Barbara, California last June and the first time they've returned to the U.K. with their children since stepping down as senior royals and relocating to California in 2020.
Meghan and Harry were photographed chatting with the Queen's first cousin, the Duke of Kent, who accompanied the monarch during her balcony appearance at Trooping the Colour.
Meghan also adorably interacted with Savannah Phillips and Mia Tindall, clearly charming the children.
Harry, who himself famously has a way with children, also playfully interacted with the royal children.
According to a source close to the royal family, the queen is delighted she will be meeting her great-granddaughter for the first time and excited to be able to spend time with Archie and Lili. ET understands Harry’s relatives are also looking forward to meeting the couple's infant daughter and seeing Archie.
The meeting will likely happen on Lilibet's first birthday, Saturday, with a source telling ET that the 96-year-old monarch will not attend the Epsom Derby on Saturday, which leaves time for her to meet her great-granddaughter.
"The Queen is not likely to attend the Epsom Derby which falls on Lilibet's first birthday, June 4, which will free her up to meet her great-granddaughter for the first time," the source says.
The source noted that Prince William and Kate Middleton will not be available to meet Meghan and Harry’s baby girl, as they will be in Wales on Saturday, at an engagement at Cardiff Castle. It's unclear whether or not they will meet her at some point during the four-day celebration.
While it will be a bit of a family reunion for Meghan and Harry, they won't be joining the queen and other members of the royal family on the balcony, or riding in a carriage during the ceremony.
A source close to the royal family told ET that the Duke and Duchess of Sussex will be joined by other members of the royal family as they watch the Trooping the Colour flyover ceremony Thursday from the Major General's Office in Buckingham Palace.
Harry and Meghan are also expected to attend the service of thanksgiving on Friday and the concert on Saturday.
Meghan and Harry's trip to England will serve as their latest visit after quietly stopping there to meet with the queen, Prince Charles and Camilla, the Duchess of Cornwall in April before heading to the Netherlands for the 2022 Invictus Games.
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