Tennis superstar Serena Williams is more ready for mommy duties than we think. The mother-to-be has penned an open message to her unborn baby.

Serena went to Instagram Monday (April 24) with a letter dishing out excitement to meet her mini-me.

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Last week, Williams shocked the Internet with her pregnancy announcement.

Serena Williams is expecting. The tennis ace confirmed Wednesday she is 20 weeks along in her pregnancy, showing off her growing baby bump in a bright yellow bathing suit on Snapchat. Williams, 35, is engaged to Reddit co-founder Alexis Ohanian, 33. The couple shared a post-Easter snap from the beach on Tuesday. (Page Six)

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Back in mid-February, Williams nearly broke the Internet with some amazing bikini shots.

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Serena recently flexed her engagement ring from celebrity fiancé Alexis Ohanian.

Serena Williams just showed the world her new engagement ring … and it’s massive. Williams posted the pic Thursday with new fiance and Reddit co-founder Alexis Ohanian and — while it’s not a super close-up of the rock — you can tell she’s sporting some serious bling. The couple announced their engagement last week … but somehow the diamond hasn’t seen the light of day until now. (TMZ)

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