The fact that Wintour chose to attend the New York Fashion Week runway debut of Williams, who just won the US Open for the third time, was a sign that Williams, who has made fashion her side gig for a number of years, had most definitely arrived.

"It means a lot ... I mean, she's Anna Wintour at the end of the day, fashion's queen," said a beaming Williams. "I hope she enjoys it."

Williams was certainly enjoying the moment.

Fresh off her U.S. Open win on Sunday, which tied her with Chris Evert and Martina Navratilova with 18th Grand Slam trophies, second only to Steffi Graff, Williams took on some of fashion's biggest names with her first runway show on Tuesday.

With celebrities like supermodel Beverly Johnson, actor Boris Kodjoe and comedian Marlon Wayans looking on, Williams showed her Serena Williams Signature Statement Collection for the HSN Network, which she described as "casual wear but pumped up, every day wear that is actually realistic."

"Sometimes you go to fashion shows and none of it is really realistic. You can take it off the models and you can go out and wear it so that is what we wanted to showcase," Williams said.

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