But tonight, it was all about the dress and her first major style maternity moment.
Serena Williams and Alexis Ohanian are waiting to find out if they are having a boy or a girl.
"I never felt pressure to get married, and I can't say I'm the marrying type", she told Gayle King. Agreeing that it was a wonderful city, she added: "I couldn't be stuck in a more handsome place".
Dressed in a flowing green gown that showed off her growing bump, the pregnant mum was a sight to behold, while her dashing partner stayed by her side, clearly proud. Donning a sleeveless halter-neck emerald green Versace gown, the sports star was looking lovely as always.
Humans of NY also spoke to a few other celebrities during the big fashion night, including Stephen Colbert and wife Evelyn McGee-Colbert, Ryan Reynolds and Blake Lively, Selena Gomez and Claire Danes and Hugh Dancy.
The 34-year-old, who is the executive chairman of Reddit, shared Williams's post alongside the message: "she said yes".
Check out her 2017 Met Gala look below. I have said it once and I'll say it again, this world has come so far but yet has so much further to go.
Claiming her story wasn't "over" she cited elder sister Venus, who is still at the top of her game at 37, as inspiration to continue with her extraordinary career and joked her baby would be in the stands "cheering her on" next year.
The star recently confessed the Snapchat which revealed she was 20 weeks along was sent by mistake.
In champion form, she admitted to loathing losing and loving victory.
"When Alexis proposed, I was nearly angry. [It's] a surprise. We call it "baby". They were just 22 at the time.
"I was so nervous", she added".