Serena Williams has arrived in New Zealand - and promptly announced she is engaged.

The world's highest paid sportswoman will marry Reddit co-founder Alexis Ohanian.

She broke the news on Reddit in the form of a poem which emerged within hours of her arriving in Auckland this morning for next week's ASB Classic tournament.

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A post shared by Serena Williams (@serenawilliams) on

She revealed Ohanian, 33, had proposed in Rome.

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"I came home. A little late. Someone had a bag packed for me. And a carriage waited. Destination: Rome," Williams, 35, wrote on her verified Reddit account.

"To escort me to my very own 'charming.' Back to where our stars first collided. And now it was full circle. At the same table we first met by chance."

She continued: "But by choice. Down on knee. He said 4 words. And r/isaidyes."

When she arrived at Auckland International Airport this morning, Williams kept her left hand hidden from waiting photographers. Photo / Michael Craig
When she arrived at Auckland International Airport this morning, Williams kept her left hand hidden from waiting photographers. Photo / Michael Craig

Ohanian also shared the Reddit post on Facebook, simply writing, "She said yes."

When she arrived at Auckland International Airport this morning, Williams kept her left hand hidden from waiting photographers.

Williams and Ohanian have up to now kept their relationship off social media.

(She said yes.) She asked me to draw her something for "the future Mrs. Kn0thing" because she had a Reddit post to make. Keeper.

Posted by Alexis Ohanian on Thursday, 29 December 2016