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

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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.:

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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