Jessica Simpson says she doesn't want more kids: 'That would freak me out'

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Jessica Simpson Has No Plans For More Kids: 'That Would Freak Me Out!'

Jessica Simpson looks as hot as ever at 35 years old, and the mother of two is opening up about workout secrets.

"A lot of squats! A lot of push-ups, got to keep these things up," she told ET on Wednesday at the 10th anniversary celebration of her company at New York City's Tavern on the Green. "And running around with my kids. That is a diet in itself."

WATCH: Jessica Simpson Shows Off Her Incredible Swimsuit Bod

Simpson, who is mother to 3-year-old daughter Maxwell and 2-year-old son Ace, is keeping her immediate family close, revealing to ET that she and younger sister Ashlee, who gave birth to daughter Jagger in July, often have playdates with their children.

"Jagger just came over to see me, Maxwell and Ace the other day and she's so tiny and so sweet!" Simpson gushed. "And Maxwell is just obsessed! She has baby dolls, she wants to be a mom already. She's a care taker!"

Jessica Simpson throughout the years:

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Jessica Simpson says she doesn't want more kids: 'That would freak me out'
NEW YORK, NY - SEPTEMBER 21: Eric Johnson (L) and fashion designer Jessica Simpson leave their Noho hotel on September 21, 2016 in New York City. (Photo by Ray Tamarra/GC Images)
NEW YORK, NY - SEPTEMBER 21: Jessica Simpson and Eric Johnson are seen at La Guardia Airport on September 21, 2016 in New York City. (Photo by Raymond Hall/GC Images)
THE TONIGHT SHOW STARRING JIMMY FALLON -- Episode 0324 -- Pictured: (l-r) Jessica Simpson during an interview with host Jimmy Fallon on September 8, 2015 -- (Photo by: Douglas Gorenstein/NBC/NBCU Photo Bank via Getty Images)
NEW YORK, NY - SEPTEMBER 10: Jessica Simpson attends Jessica Simpson and Mike Gansmoe ring the New York Stock Exchange Opening Bell at New York Stock Exchange on September 10, 2015 in New York City. (Photo by Andrew Toth/Getty Images)
NEW YORK, NY - SEPTEMBER 10: Singer/fashion designer Jessica Simpson poses for photographs after ringing the New York Stock Exchange opening bell at the New York Stock Exchange on September 10, 2015 in New York City. (Photo by Brent N. Clarke/WireImage)
NEW YORK - SEPTEMBER 09: Jessica Simpson and Eric Johnson are seen out in Manhattan on September 09, 2015 in New York, New York. (Photo by Josiah Kamau/BuzzFoto via Getty Images)
NEW YORK, NY - SEPTEMBER 09: Jessica Simpson attends Jessica Simpson Collection Presentation Spring 2016 New York Fashion Week on September 9, 2015 in New York City. (Photo by Desiree Navarro/WireImage)
NEW YORK - SEPTEMBER 09: Jessica Simpson and Eric Johnson are seen out in Manhattan on September 09, 2015 in New York, New York. (Photo by Josiah Kamau/BuzzFoto via Getty Images)
NEW YORK, NY - SEPTEMBER 08: Jessica Simpson Visits 'The Tonight Show Starring Jimmy Fallon' at Rockefeller Center on September 8, 2015 in New York City. (Photo by Theo Wargo/NBC/Getty Images for 'The Tonight Show Starring Jimmy Fallon')
NEW YORK, NY - SEPTEMBER 09: Eric Johnson and Jessica Simpson attend Jessica Simpson Collection - Presentation - Spring 2016 New York Fashion Week at Tavern on the Green on September 9, 2015 in New York City. (Photo by Taylor Hill/FilmMagic)
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Her extended family may be growing but are there more kids in her future?

"No more kids on the horizon," she admitted. "That would freak me out a little bit."

WATCH: Jessica Simpson Plans Return to Music: My Husband Has Never Really Seen Me Onstage

Simpson hasn't released an album since 2008, but she hinted that new music may be coming sooner than you might think.

"I feel like I'm at such a comfortable place to like open my heart and share so much with everybody," she told ET. "So, music makes the most sense."

Simpson, whose company is valued at over $1 billion, opened up about her success and longevity in the business world.

"I think it's really just understanding a woman," the entrepreneur said. "I understand a women! I know how to make a woman feel beautiful. Any and every kind of woman. So I am celebrating that woman tonight."

FLASHBACK: An 18-Year-Old Ashlee Simpson Teases Jessica Simpson About Motherhood

Flashback! 18-Year-Old Ashlee Simpson Teases Jessica Simpson About Becoming a Mom Someday!

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