The Duchess of Cambridge and the Duchess of Sussex will attend Wimbledon together on Saturday.
Kate and Meghan will watch Serena Williams playing Angelique Kerber in the Wimbledon ladies' singles final from the Royal Box at Centre Court.
It will mark the pair's first official engagement together without their husbands.
Kate, Duchess of Cambridge, has often been seen in the Wimbledon royal box over the years with her husband, The Duke of Cambridge, and family members.
She is Patron of the All England Lawn Tennis Club.
Kate, 33, will also attend the gentleman's singles final on Sunday alongside Prince William.
This will be the first Wimbledon royal box experience for Meghan, Duchess of Sussex, although the 36-year-old has attended the tournament in previous years before meeting now-husband Prince Harry.
We always have supported each other, just been there for each other through a lot.
It will be a particularly special day out for Meghan, as she's known to be good friends with Serena, 36, who was among the guests invited to the royal wedding in May.
Serena told reporters this week that she and Meghan have "always had a wonderful friendship".
She said former Suits actress Meghan had supported her in previous years at Wimbledon and although this time around Meghan will be watching from the royal box, their friendship has not changed.
"We always have supported each other, just been there for each other through a lot," said Serena.
"I look forward to it."
Serena gave birth to her first child, daughter Alexis Olympia Ohanian Jr, less than a year ago and if she wins Wimbledon, she'll be the first mother since 1980 to pick up the trophy.
It's been a busy week for the royals with multiple public appearances.
They started the week with 11-week-old Prince Louis' christening on Monday, which marked the first time The Duke and Duchess of Cambridge had been pictured with all five children. They're also parents to George, four, and Charlotte, three.
The Duke and Duchess of Sussex were in attendance at the christening.
The following day, both couples joined The Queen and other senior royals for a day of celebrations to mark the RAF's 100th anniversary, which included a fly-past at Buckingham Palace, giving Meghan her second-ever balcony experience.
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Later that day, Meghan and Harry flew to Dublin for a whirlwind two-day visit on behalf of the British government.
It marked their first overseas tour as a married couple and saw engagements including visiting the Book of Kells, Croke Park and the Famine Memorial, and a garden party at the British Ambassador's official residence.
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