Serena Williams' daughter becomes Vogue's youngest-ever cover star

Serena Williams and her daughter, Alexis Olympia Jr., are Vogue's February cover stars!

The stunning duo appear on the cover that declares "Love All," with Serena rocking a form-fitting red leotard and Alexis donning a simple white one-piece. Serena's massive engagement ring is on firm display as she holds Alexis in her left hand. 

SEE ALSO: Kate Middleton turns 36: All the exciting things to come this year

By appearing on the cover at somewhere between three and four months (depending on when the cover shoot happened), Alexis becomes Vogue's youngest-ever cover star in the iconic fashion magazine's 125-year history. The February issue marks Serena's third time on the cover of U.S. Vogue.

In the accompanying shoot -- shot by famed fashion photographer Mario Testino -- Williams poses with husband Alexis Ohanian, as well as the rest of the Williams women: Sisters Venus, Isha and Lyndrea, as well as her mother, Oracene Price. 

Serena Williams with her daughter, Alexis Olympia Ohanian Jr.:

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Serena Williams and her daughter Alexis Olympia Ohanian Jr.
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Serena Williams and her daughter Alexis Olympia Ohanian Jr.
My baby is 6 months today. So yummy.
She wanted to dress 80's
Welcome home momma
She's like "Mommmmmmmmmmm my friends are looking" #freshfaces
Just how I look at her
When I first saw this @voguemagazine cover it brought tears to my eyes. All Vogue covers are special but to share this one with my beautiful daughter @olympiaohanian also the youngest Vogue cover star makes it moment I will never forget. The article is a must read. Link in bio
Mommy and me
My mommy loves Snapchat
Mama never sleeps. When she does, I go on adventures with daddy. "Come on!"
My final top 10 moment of 2017. Of course includes @olympiaohanian they say save the best for last. I could not choose so I just choose 10 random videos. They all were so cute to me 🤷🏾‍♀️🤷🏾‍♀️
There are so many reasons to quit, but even more to keep playing. Even if you don’t go pro, sports can teach you so much. So keep playing. Link in bio. #sistersinsweat #gatoradepartner @gatorade
Meet Alexis Olympia Ohanian Jr. You have to check out link in bio for her amazing journey. Also check out my IG stories 😍😍❤️❤️
We clearly don't take enough family portraits. This one's from the honeymoon. @olympiaohanian was not ready for the snap... 😒 2017 was a year to remember for a lot of reasons (good as well as bad) so that they may all serve as motivation, inspiration, and a compass for what we know to be right. These two women are my everything. And the duty I have to them as a husband and a father is the greatest responsibility I'll have in my life; I'm honored to bear it. And I know I'll always find new ways to keep making you, laugh, @serenawilliams. 2018 is going to be a phenomenal year. And may there be many, many more to come. Wherever you are in the world tonight, I hope you're with people you love.
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Williams, 36, also opened up about the terrifying health complications that emerged following the birth of her first daughter back in September. The day after going through an emergency C-section because of the baby's dropping heart rate, Williams was experiencing shortness of breath and went in for a CT scan, which found blood clots in her lungs. 

Later, an intense coughing spell opened up her C-section scar and, during the surgery to close up the wound, doctors discovered that a hematoma had developed in her abdomen. As Williams told Vogue, everything went from "amazing" to "bad" very quickly.

She and Alexis' night nurse also abruptly informed them that she was no longer available to work for them, adding to the pressure she was already feeling as a new mother.

"Sometimes I get really down and feel like, Man, I can’t do this," Serena said. "It’s that same negative attitude I have on the court sometimes. I guess that’s just who I am. No one talks about the low moments -- the pressure you feel, the incredible letdown every time you hear the baby cry. I’ve broken down I don’t know how many times. Or I’ll get angry about the crying, then sad about being angry, and then guilty, like, Why do I feel so sad when I have a beautiful baby? The emotions are insane."

Read Williams' full cover story for Vogue's February issue here.

RELATED: See photos from Serena Williams and Alexis Ohanian's wedding:

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Inside Serena Williams' wedding
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Inside Serena Williams' wedding
For the first dress When Anna Wintour asked me what I wanted to wear I said "a cape" I just want to wear a cape" she said: "well Sarah Burton with @alexandermcqueen is the one for you.” Thanks Anna. Thanks Sarah. I felt like a princess and superwoman all at once. 📸: @mistadubb @ericamelissa_
After tying the knot with @alexisohanian last night, @serenawilliams debuted her second dress of the evening, a dramatic beaded, feathered @versace_official moment that made her look like a fashion-forward superwoman. Tap the link our bio to see all the stunning photos. Photographed by @melbarlowandco and @allanzepedaphotography.
Official. 📸 @melbarlowandco @allanzepedaphotography
@serenawilliams married @alexisohanian in a stunning Sarah Burton for @alexandermcqueen princess gown. Tap the link in our bio for more exclusive photos from the star-studded celebration. Photographed by @mistadubb and @ericamelissa_.
I love you both and I'm so incredibly proud of you! Welcome to the club! ❤😍❤😍❤😍❤😍❤😍❤
“You are the greatest of all time, not just in sport. I’m talking about as a mother, and as a wife. I am so excited to write so many more chapters of our fairy tale together.” Congratulations to @serenawilliams and @alexisohanian, who exchanged vows last night. Tap the link in our bio to see the exclusive first photos from their fairytale wedding in New Orleans. Photographed by @melbarlowandco and @allanzepedaphotography.
💃🏿🕺🏻 📸 @melbarlowandco @allanzepedaphotography
Dance with new edition? Check ✅. 📸: Bob Metelus and Erica Rodriguez
Squad....💙💛celebrating love❤️
@serenawilliams: You are the greatest of all time, not just in sport--I’m talking about as a mother and as a wife. I am so excited to write so many more chapters of our fairy tale together. And my whole life I didn’t even realize it, but I was waiting for this moment. And everything that I have done, everything that I am so proud of in my career, and in my life, for the last 34 years, pales in comparison to what we’re doing today. And I am so grateful, and I am so in love. 📸 @melbarlowandco @allanzepedaphotography
Alani & Kimmie❤️THE ROYAL BALL 👑🎩
Each one of my groomsmen is a best friend who also represents a different period of my life. Jon: childhood Huu: @uva Steve: @reddit Michael: my book & tour, Without Their Permission Garry: Initialized Capital To be rich with great friends is a privilege -- and it's no surprise that they all love my bride.
Dressed for The Most Royal Ball 🌹
The Royal Ball. @MichaelCostello ❤️
THE ROYAL BALL 👑🎩 @verawanggang
Yaaaaaay!! So Happy! God is so Good! Love you @AlexisOhanian & @SerenaWilliams! Yallz Murrrred! 🙌🏽🥂💍❤️
Now i can say that i was at one of the most beautiful weddings ! That room was so filled with joy and love . Real Love with real folks. Congratulations to this amazing couple. Alex and Serena ❤️
Meet Michelle @merakimishell the amazing woman behind my incredible @nike Cortez shoes? Yes I wore them down the asile! Comfort for this bride! Thanks Michelle!!! 😍😍
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