Joanna Gaines reveals what rooms you don't see on 'Fixer Upper' actually look like

Joanna Gaines just answered one of the burning questions that fans of "Fixer Upper" have always had: What about the rooms that we don't see on the show?

In a sneak peek of her upcoming HGTV spinoff, "Fixer Upper: Behind the Design," Gaines reveals what really goes on in those spare rooms. Do they get redone? What about the furniture?

SEE ALSO: 10 facts about 'Fixer Upper' stars Chip and Joanna Gaines that you didn't know

In the clip, which is exclusive to People, Gaines is shown decorating the living room of a home before it cuts to her in what appears to be a storage room. Surrounded by bins and boxes and vacuum cleaners and plants, Gaines says that she "always likes to bring too much" to ensure she has enough things to decorate the house with.

See photos of "Fixer Upper" couple Chip and Joanna Gaines:

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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)
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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"The behind the scenes here is that, most of the time when it's the reveal, people wonder, 'What about the other bedrooms?'" Gaines says to the camera as she looks around at the piles of stuff. "Well, this is one of the bedrooms, and it's finished!"

Watch the clip from "Fixer Upper: Behind the Design" below:

"We've got a new light fixture in here, we've got all new trim and paint," she continues. "It's really pretty, except all of my stuff is in here."

"Typically, two to three of the rooms you don't see in the reveal look just like this," she finishes.

So, essentially, the spare rooms all get outfitted with new paint jobs and finishings, but they don't get decked out with all new furniture. Instead, the rooms are used to temporarily store all of the Gaines' extra decorations, accessories and supplies that they don't end up using for the final reveal.

For a full sneak peak of "Fixer Upper: Behind the Design," tune into HGTV on Tuesday, March 28 at 11:00 p.m. EST.

10 things you didn't know about Chip and Joanna Gaines:

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10 facts you didn't know about 'Fixer Upper' stars Chip and Joanna Gaines
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10 facts you didn't know about 'Fixer Upper' stars Chip and Joanna Gaines

They both attended Baylor University, but the two actually didn't meet in school! 

Jo's father owned tire shop and he saw a picture of her hanging behind the store counter. He convinced himself he was gonna marry Jo even before they had actually met.

(Photo: Getty)

Jo was a communications major at Baylor University and she had dreams of becoming a broadcast journalist. 

Before getting her big break on "Fixer Upper," she actually appeared in commercials for her father's tire shop. Chip eventually used the commercial in a pick-up line when they first met ... and the rest is history!

As for Chip, he had other aspirations, like being a baseball player or politician. 

If it ain't broke, don't fix it! Chip stays loyal to his favorite clothing brands. In fact, he's worn the same style of jeans and boots since they got married in 2003 -- Gap 1969 standard-fit jeans and Ariat boots.

His ladylove, on the other hand, prefers Citizen low-rise skinny jeans and Frye boots. 

As you can probably tell from all their renovations on "Fixer Upper," Jo loves to decorate with pretty blooms and greenery. Her favorite flower? Pink antique roses.
Chip and Jo's Pinterest-perfect farmhouse sits on 40 acres of land, which is just big enough for their 60 animals to roam around in.
Jo knew the value of hard work even when she was very young. Her first job? At an all-you-can-eat buffet. To this day, she says still appreciates buffet lines, but her husband has different thoughts on the matter.

The couple's first fixer-upper home? Their very own abode that they started working on soon after their honeymoon. The 1,700-square-foot Victorian home they currently live in is the ninth home they've lived in and renovated together.

The name "Magnolia," which they named all their businesses after (Magnolia Homes, Magnolia Market, Magnolia Farms) holds a special meaning. When they first started dating, Chip would bring blooms from Magnolia trees to Jo.

The Gaines family doesn't own a television! They go over to a friend's house every week to watch their own "Fixer Upper" episodes or in their hotel room during trips.

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