Chris, 39, and Katherine, 29, were all smiles as they looked for furniture and home decorations.
At one point, the couple was seen looking very closely at something.
The actor proved the house they're moving into was empty when he posted pictures of his fiancée using herself as a measuring tape on Instagram.
Once Chris realized the cameras arrived to the design store, he started hamming off and even made his leading lady burst out in laughter.
What do you think about Chris and Katherine getting ready to decorate? Let us know in the comments.