How sweet! Serena Williams is a juggernaut, on and off the tennis court. She constantly shuts down sexism, has discussed positive body image at length, and won her 23rd Grand Slam title while she was casually nine weeks pregnant. But according to a recent interview, she actually considers Kate Middleton to be one of the most impressive women she knows.

The tennis legend was asked for her list of “badass women” in an interview with InStyle, and she replied, “Well, obviously Beyoncé. That goes unsaid. Rihanna goes unsaid. Kate Middleton!” Her interviewer, Laura Brown, agreed, “Could you imagine having a baby and then, right after, you put on makeup and go out to greet the public?” Serena countered incredulously, “No, and she was…  standing! So she’s officially No. 1.”

kate middleton

The interview echoes what Serena has said about the royal in the past. “I was really busy, but I saw the baby, and Kate was dressed, and I was like, ‘Oh, maybe she had him a couple days ago,'” she told POPSUGAR. “That’s one heck of a woman! Let me tell you, I was not in heels [after I gave birth]. I thought she gave birth maybe two days before! Wow.”

The fact that Serena wasn’t in heels so soon after daughter Alexis was born probably shouldn’t surprise you given that she chose to wear sneakers with her stunning Valentino gown at Meghan Markle and Prince Harry’s recent wedding reception. “I was supposed to wear heels originally, and I’m thinking, ‘C’mon, Serena — reception. Heels or shoes? Heels or shoes?’ I decided to go with the shoes,” she confessed.

But we must admit, Kate’s turnaround after welcoming her third royal baby in April was certainly something to behold. Just five hours after the 36-year-old gave birth to baby Prince Louis, she was standing outside the hospital being photographed by a zillion people —with a blow out, no less!

Dr. Philippa Costley, a spokesperson for the Royal Australian and New Zealand College of Obstetricians and Gynaecologists, recently told Now to Love that most women stay one to two nights in the hospital after an uncomplicated vaginal delivery, but if they have enough support at home — something Kate certainly has — they can leave the maternity ward after four hours. Interesting, right?!

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This post was written by Kate Wagner. It originally appeared on our sister site, Now to Love.