Serena Williams Debuts Baby Bump at the 2017 Met Gala

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Serena Williams at the 2017 Met Gala

The tennis star glows in green.

Mom-to-be Serena Williams arrived at this year's Met Gala in New York in a green gown, showing off her growing baby bump.

This year's gala theme celebrates the museum's Costume Institute exhibition "Rei Kawakubo / Comme des Garçons: Art of the In-Between," which features approximately 150 womenswear designs that Kawakubo has created for Japanese brand Comme des Garcons since her first presentation at Paris Fashion Week in 1981.

The tennis star, who is engaged to Reddit co-founder Alexis Ohanian, recently announced via Snapchat that she is expecting — even though her photo was posted by accident.