Williams and her husband, Reddit co-founder Alexis Ohanian, were two of the high-profile celebrities who attended Meghan’s wedding to Prince Harry in May.

\"PHOTO:
WPA Pool/Getty Images, FILE
PHOTO: Serena Williams and her husband Alexis Ohanian arrive for the wedding ceremony of Britain's Prince Harry and Meghan Markle at St George's Chapel, Windsor Castle on May 19, 2018 in Windsor, England.
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Williams called the wedding at St. George's Chapel, which featured a gospel choir and an African-American minister who delivered a show-stopping sermon, a “monumental moment.”

“I felt like we were literally watching history and I feel like in a few years when I look back at that moment and it’s just going to be historic,” she said. “It’s going to be something that people never forget.”

She added, “The whole service was really wonderful. Most of all I just really wanted to see my friend be happy and I think that’s what happened.”

\"PHOTO:
Dominic Lipinski/AP
PHOTO: Britain's Prince Harry and Meghan Markle stand, prior to the start of their wedding ceremony, at St. George's Chapel in Windsor Castle in Windsor, May 19, 2018.
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Duchess Meghan showed up to support Williams at the Wimbledon final in July. Just before the start of Wimbledon, Williams and Ohanian joined Meghan to watch Prince Harry play polo.

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A post shared by Kensington Palace (@kensingtonroyal) on Jul 14, 2018 at 9:49am PDT

When Meghan launched a cookbook this month -- her first major charitable initiative since joining the royal family -- it was Williams who very publicly supported her friend.

\"I could not be more excited about it and proud of you,\" she posted on social media.

S
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I used to call you Meghan (and I still do) but dear Duchess of Sussex your first project “Together” a cookbook bringing women of all cultures together. I could not be more excited about it and proud of you. It’s beautiful - diversity, inclusivity, coming together in grief or joy - there is just so much love. Link in bio to learn more, and how you can get a copy!

A post shared by Serena Williams (@serenawilliams) on Sep 17, 2018 at 5:45am PDT

Williams has reached the finals of two Grand Slam tournaments since giving birth to her first child, daughter Olympia.

Williams opened up in her interview with \"The Project\" about how it has been \"really tough\" to return to tennis full-time since giving birth to Olympia last September. She described herself as \"really excelling\" at some aspects of motherhood and feeling \"like a fish out of water\" in others.

\"Sometimes I go out to play my matches and I’m leaving my daughter and it’s heart wrenching to walk out that door and she’s crying and she’s upset because she misses me,\" Williams said. \"We’re really close and that’s not always easy.\"

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A post shared by Serena Williams (@serenawilliams) on Sep 15, 2018 at 5:53pm PDT

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