EXCLUSIVE: 'Fixer Upper' Star Joanna Gaines Talks Surviving Husband Chip's Pranks and Achieving Their Dreams

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Home makeover moguls Chip and Joanna Gaines return to HGTV with more Fixer Upper on Nov. 29, and we have a sneak peek!

"We take the worst house in the best neighborhood and we turn it into our client's dream home," Chip says in the season four trailer.

WATCH: Joanna and Chip Gaines Reveal How They Keep the Spark Alive After 13 Years of Marriage

The happy couple have been making family's dreams come true since 2013 by turning Waco, Texas, into the renovation capital of the world, and ET's Cameron Mathison got to see what they're like at home when he visited their 40-acre farm.

True to form, Chip started our interview by playing a trick on Joanna.

"You got something in your ear here," Chip whispered, pretending to pull an egg out of his wife's ear.

When Joanna jolted away, Chip beckoned her back, saying, "Jo, it's just an egg."

WATCH: Chip and Joanna Gaines Talk 'Fixer Upper' Success

"I thought it was going to be a dead animal," Joanna admitted. "I always have to look over my shoulder. I'm like, 'What is he about to do to me now?' Usually it's disgusting."

Chip and Joanna are now in their 13th year of marriage together, and despite the occasional disagreement, like any other couple, the laughs never stop in the Gaines household, as they juggle their rising careers and raising four children.

"One of the secrets to our marriage, or the success of our marriage, is just really caring about one another," Chip said.

Fans can now read about their love story inside the pages of their book, The Magnolia Story. In the book, Joanna reveals that she turned down a recent opportunity to upgrade her wedding ring because of the sentimental value attached to the original.

"This is the original diamond I picked, and it's perfect just the way it is," said Joanna, who designed the ring with a jewelry store owned by a family friend.

WATCH: Inside the Glass Houses of Hollywood Stars

Their company, Magnolia Homes, has remodeled well over 100 houses and counting, with Joanna as lead designer and Chip executing his wife's vision by managing construction.

"For me, it's a dream come true, because at the end of the day what we're passionate about is creating homes for families," Joanna said.

"You always thought we'd be successful, but did you think it would ever be anything like this?" Chip asked.

"Never," Joanna admitted. "Never a TV show and never on this national platform."

Watch the video below to hear Joanna explain why their children don't have cell phones.