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Meghan Marklesupported her good friend, tennis starSerena Williamsat the U.S. Open Finalson Saturday.

The royal mom was all smiles in Williams’ box at Arthur Ashe Stadium, where she sat in front of Anna Wintour and behind Williams’ husband Alexis Ohanian, to watch her friend play against Bianca Andreescu in the final.

The outing marks the Duchess of Sussex’s first trip overseas without her 4-month-old son,Archie. On Friday, Meghan, 38, made an unexpected last-minute trip aboard a commercial flight from London, PEOPLE confirmed.Prince Harryremained home with their son in Windsor.

Meghan is expected to return to Britain at the end of the weekend. “It is a last-minute trip,” a source toldThe Times, which broke the story of the royal’s plans. “Excited to support her friend, and then come back.”

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In July, Meghan and some friends watched Serena’s match at the Wimbledon championships. She then joined sister-in-lawKate Middletonfor the women’s final.

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Williams said that having Meghan’s support and friendship “is great,” telling reporters during herpost-match press conferencein July: “She’s such a great friend and a great person as well. And always positive, no matter what.”

The tennis star continued, “It’s so good to have people like that, just to know,” adding that Meghan, 37, is “such a fan of the sport.”

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Kate Middleton and Meghan Markle at Wimbledon.James Marsh/BPI/Shutterstock

Catherine Duchess of Cambridge and Meghan Duchess of Sussex

Meghan and Williams are also both new moms — the royal welcomedson Archiewith husbandPrince Harryon May 6, while Williams is mom to 2-year-old daughterAlexis Olympia.

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Ina recent interview, the tennis star shared that she is refraining from offering parenting advice to Meghan for now.

source: people.com