Last week, Serena Williams served up some major news equivalent to her 128-mile-per-hour serve: She and her Reddit co-founder fiancé, Alexis Ohanian, were expecting their first child together.

Today, in a slightly more direct way, Williams officially confirmed the happy news to fans and the masses alike, by penning this incredibly sweet and touching message to baby "number one."

"My dearest baby," she wrote. "You gave me the strength I didn’t know I had. You taught me the true meaning of serenity and peace. I can't wait to meet you. I can't wait for you to join the players box next year. But most importantly, I am so happy to share being number one in the world with you... once again today. On @alexisohanian bday. From the world's oldest number one to the world's youngest number one.—Your Mommy."

So, your mom just so happens to be the number one tennis player in the world and the highest-paid female athlete in the world. No braggies or anything.

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