Serena Williams says she 'definitely' wants two kids with husband Alexis Ohanian (Exclusive)

Serena Williams is already thinking about expanding her family!

ET's Kevin Frazier caught up with the 36-year-old tennis pro at the 14th Annual Desert Smash Celebrity Tennis Event in La Quinta, California, on Tuesday, where she opened up about motherhood and her marriage to Alexis Ohanian.

"It's been amazing," said Williams, who gave birth to her and her husband's first child, baby girl Alexis Olympia, last September. "I've always wanted to be a mom but I never seemed to have time with my career. Then, it just happened, and I was like, 'I don't know.' I just dove right in."

"It's so natural for me," she continued. "I love it. I love her so much. We have a great little family going on."

See recent photos of Serena Williams:

15 PHOTOS
Serena Williams in 2018
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Serena Williams in 2018
MIAMI, FL - MARCH 19: Serena Williams is seen at the 2018 Miami Open Hard Rock Stadium Ground Breaking Ceremony at Hard Rock Stadium on March 19, 2018 in Miami, Florida. (Photo by Alexander Tamargo/WireImage)
INDIAN WELLS, CA - MARCH 12: Venus Williams and Serena Williams pose for a photo before their match against each other during the BNP Paribas Open at the Indian Wells Tennis Garden on March 12, 2018 in Indian Wells, California. (Photo by Harry How/Getty Images)
INDIAN WELLS, CA - MARCH 10: Serena Williams ( USA ) hits a backhand the second round of the BNP Paribas Open on March 10, 2018, at the Indian Wells Tennis Gardens in Indian Wells, CA. (Photo by Adam Davis/Icon Sportswire via Getty Images)
INDIAN WELLS, CA - MARCH 08: Serena Williams leaves the court after defeating Zarina Diyas of Kazakhstan during the BNP Paribas Open at the Indian Wells Tennis Garden on March 8, 2018 in Indian Wells, California. (Photo by Matthew Stockman/Getty Images)
NEW YORK, NEW YORK - MARCH 5: Serena Williams of the United States in action during the Tie Break Tens Tennis Tournament at Madison Square Garden on March 5, 2018 New York City. (Photo by Tim Clayton/Corbis via Getty Images)
NEW YORK, NEW YORK - MARCH 5: Venus Williams of the United States and her sister Serena Williams of the United States during the Tie Break Tens Tennis Tournament at Madison Square Garden on March 5, 2018 New York City. (Photo by Tim Clayton/Corbis via Getty Images)
LA QUINTA, CA - MARCH 06: Serena Williams attends 14th Annual Desert Smash Celebrity Tennis Event on March 6, 2018 in La Quinta, California. (Photo by Michael Bezjian/Getty Images for Kelly Howard)
LA QUINTA, CA - MARCH 06: Serena Williams attends 14th Annual Desert Smash Celebrity Tennis Event on March 6, 2018 in La Quinta, California. (Photo by Michael Bezjian/Getty Images for Kelly Howard)
NEW YORK, NY - MARCH 05: Serena Williams of the United States reacts during her match against Shuai Zhang of China during the Tie Break Tens at Madison Square Garden on March 5, 2018 in New York City. (Photo by Elsa/Getty Images)
NEW YORK, NY - MARCH 05: The United States Women's Olympic hockey team poses with their gold medals and tennis champions Serena Williams anf Venus Williams during the Tie Break Tens at Madison Square Garden on March 5, 2018 in New York City. (Photo by Elsa/Getty Images)
ASHEVILLE, NC - FEBRUARY 11: Serena Williams of Team USA reacts after a shot to Lesley Kerkhove and Demi Schuurs of the Netherlands during a doubles match in the first round of the 2018 Fed Cup at US Cellular Center on February 11, 2018 in Asheville, North Carolina. (Photo by Richard Shiro/Getty Images)
ASHEVILLE, NC - FEBRUARY 10: Serena Williams of Team USA, bottom left, along with her husband Alexis Ohanian and their daughter Alexis Olympia, center, watch the action during the first round of the 2018 Fed Cup at US Cellular Center on February 10, 2018 in Asheville, North Carolina. (Photo by Richard Shiro/Getty Images)
ABU DHABI, UNITED ARAB EMIRATES - DECEMBER 30 : Serena Williams of United States in action during her Ladies Final match against Jelena Ostapenko of Latvia on day three of the Mubadala World Tennis Championship at International Tennis Centre Zayed Sports City on December 30, 2017 in Abu Dhabi, United Arab Emirates. (Photo by Mahmoud Khaled/Anadolu Agency/Getty Images)
ABU DHABI, UNITED ARAB EMIRATES - DECEMBER 30 : Serena Williams of United States is seen after her Ladies Final match against Jelena Ostapenko of Latvia on day three of the Mubadala World Tennis Championship at International Tennis Centre Zayed Sports City on December 30, 2017 in Abu Dhabi, United Arab Emirates. (Photo by Mahmoud Khaled/Anadolu Agency/Getty Images)
ABU DHABI, UNITED ARAB EMIRATES - DECEMBER 30: Serena Williams of United States smiles during her Ladies Final match against Jelena Ostapenko of Latvia on day three of the Mubadala World Tennis Championship at International Tennis Centre Zayed Sports City on December 30, 2017 in Abu Dhabi, United Arab Emirates. (Photo by Tom Dulat/Getty Images)
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Although Williams is still keeping busy with her sport -- she played her first competitive match since giving birth last month! -- she told ET that baby Olympia always comes first, no matter what.

"Working motherhood is real. It's so real," she joked. "But I have my priorities and Olympia is that. And Alexis [co-founder of Reddit] works all the time as well. He's not even here right now, he's working on his new VC fund. So, that's great! But I'm never a day without Olympia. She's my priority and everyday I need to be home with her. I don't wanna miss any moments with her."

Williams continued on, telling ET that Olympia's had plenty of precious moments already. However, there's one that especially stands out.

"Her toothless smile," she gushed. "She's so happy. That is my favorite thing, her toothless smile."

See photos of Alexis Olympia:

18 PHOTOS
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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The Saginaw, Michigan, native also told us she's working on coming up with a special signal for her and Olympia. "We're together so much," she explained. "I was thinking, I always check on her. I always check the monitor and the video. I'm like, 'OK, what if I'm on the court and I'm thinking about Olympia?' I have to have a signal that she's doing good ... I need to come up with something because I'm always thinking about her."

Another thing she's recently started thinking about? Giving Olympia a baby brother or sister!

"I definitely want two [kids], God willing," she exclaimed. "But right now, I want tennis as well. So, I'm going to wait and see what happens."

"It's definitely not easy," she added. "I have this undying drive to be the best that I can be. Whether it's [being] a mom or playing tennis or doing my designing. I just want to do the best that I can."

It doesn't get much cuter than that! 

Williams was a special guest at Tuesday's Desert Smash, a charity celebrity tennis event where the top ATP and WTA Tour Pros come together to play for a day with Hollywood's biggest stars. The event benefited The Yetunde Price Resource Center (YPRC) charity, which was founded by Williams and her sister, Venus, in honor of their eldest half-sibling, Yetunde Price, who was killed in 2003. YPRC honors the life and legacy of its namesake by assisting, educating and strengthening individuals and families affected by violence and trauma. Additionally, the event also benefited the Sophie's Voice Foundation, which supports Global Health and Wellness initiatives in multicultural communities.

"It means a lot for me to be here and have everyone else come out as well for my sister who is no longer with us," Williams told ET. "We have a foundation in her name and it's great. It's great to give back to the people that have unfortunately had to deal with the tragedy that we had to deal with as well."

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