EXCLUSIVE: Joanna and Chip Gaines reveal how they keep the spark alive after 13 years of marriage

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ET was with Fixer Upper stars Chip and Joanna Gaines as they celebrated their 13th wedding anniversary in New York City's Central Park, where we got the couple to share what it takes to have a successful marriage.

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

WATCH: 'Fixer Upper' Star Joanna Gaines Reveals Chip's Man Crush

Fans of their HGTV show know how well the couple gets along and now they've detailed their love story inside the pages of their new book The Magnolia Story.

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'Fixer Upper' Joanna & Chip Gaines
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NEW YORK, NY - DECEMBER 08: Designers Joanna Gaines and Chip Gaines attend AOL Build Presents: 'Fixer Upper' at AOL Studios In New York on December 8, 2015 in New York City. (Photo by Desiree Navarro/WireImage)
NEW YORK, NY - DECEMBER 08: Designers Chip Gaines and Joanna Gaines attend AOL Build Presents: 'Fixer Upper' at AOL Studios In New York on December 8, 2015 in New York City. (Photo by Desiree Navarro/WireImage)
In this March 29, 2016 photo, Chip Gaines poses for a portrait in New York to promote their home improvement show, "Fixer Upper," on HGTV. (Photo by Brian Ach/Invision/AP)
In this March 29, 2016 photo, Joanna Gaines, left, and Chip Gaines pose for a portrait in New York to promote their home improvement show, "Fixer Upper," on HGTV. (Photo by Brian Ach/Invision/AP)
In this March 29, 2016 photo, Joanna Gaines poses for a portrait in New York to promote their home improvement show, "Fixer Upper," on HGTV. (Photo by Brian Ach/Invision/AP)
In this March 29, 2016 photo, Joanna Gaines, left, and Chip Gaines pose for a portrait in New York to promote their home improvement show, "Fixer Upper," on HGTV. (Photo by Brian Ach/Invision/AP)
THE CHEW - Chip and Joanna Gaines as well as Victoria Justice are the guests on Wednesday, October 19, 2016 on ABC's 'The Chew.' 'The Chew' airs MONDAY - FRIDAY (1-2pm, ET) on the ABC Television Network. (Photo by Lorenzo Bevilaqua/ABC via Getty Images) CARLA HALL, CHIP GAINES, MICHAEL SYMON, JOANNA GAINES, DAPHNE OZ, CLINTON KELLY
THE CHEW - Chip and Joanna Gaines as well as Victoria Justice are the guests on Wednesday, October 19, 2016 on ABC's 'The Chew.' 'The Chew' airs MONDAY - FRIDAY (1-2pm, ET) on the ABC Television Network. (Photo by Lorenzo Bevilaqua/ABC via Getty Images) JOANNA GAINES, MICHAEL SYMON, CHIP GAINES
NEW YORK, NY - OCTOBER 19: Chip Gaines and Joanna Gaines appear to promote 'The Magnolia Story' during the AOL BUILD Series at AOL HQ on October 19, 2016 in New York City. (Photo by Donna Ward/Getty Images)
NEW YORK, NY - OCTOBER 19: Chip Gaines and Joanna Gaines appear to promote 'The Magnolia Story' during the AOL BUILD Series at AOL HQ on October 19, 2016 in New York City. (Photo by Donna Ward/Getty Images)
NEW YORK, NY - OCTOBER 19: Chip Gaines and Joanna Gaines attend The Build Series to discuss 'The Magnolia Story' at AOL HQ on October 19, 2016 in New York City. (Photo by Laura Cavanaugh/WireImage)
NEW YORK, NY - OCTOBER 19: Chip Gaines and Joanna Gaines attend The Build Series to discuss 'The Magnolia Story' at AOL HQ on October 19, 2016 in New York City. (Photo by Laura Cavanaugh/WireImage)
NEW YORK, NY - OCTOBER 19: Chip Gaines and Joanna Gaines attend The Build Series to discuss 'The Magnolia Story' at AOL HQ on October 19, 2016 in New York City. (Photo by Laura Cavanaugh/WireImage)
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In the book, Joanna shares how Chip proposed to her by bringing her to a jewelry store owned by a family friend, where Joanna was able to design her own engagement ring. Twelve years later, when the couple was able to afford a better diamond, Joanna decided to not to replace the stone, saying, "This is the original diamond I picked, and it's perfect just the way it is."

EXCLUSIVE: Chip and Joanna Gaines Talk 'Fixer Upper' Success: 'It's a Dream Come True'

It's their frugality that seems to have been one of the secrets to their financial success.

"Our idea of splurging is going to a full-priced meal without a coupon," Chip said. "That's our idea of 'Hey we're going for it! We're not even going take the coupon with us tonight!'"

As the proud parents of four children, all that budgeting could come in handy, especially if Joanna gets her wish of having two more children.

"You wish," Chip said.

EXCLUSIVE: 'Fixer Upper' Star Joanna Gaines Explains Why Her Kids Don't Have Cell Phones

Fixer Upper airs at 9 p.m. ET/PT on HGTV.

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