Earlier that morning, Chris called Lauren, 29, "the love of my life" on Instagram.
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The country singer hinted he might be getting ready to propose back in January when he posted an Instagram photo of himself playing golf with Lauren's dad and captioned it, "Great day on the course with my potential future father-n-law."
Chris also praised his relationship with Lauren during his red-carpet appearance, saying things are "so easy" for them.
"She actually just moved her life from L.A. to Nashville, and I was a little nervous about that because I'm probably the cleanest person in the world and I thought to myself, 'If she's not... it could be a dealbreaker in a way.'"
But Chris was pleasantly surprised to find out how clean and organized Lauren turned out to be.
"She is, honestly, worse than I am when it comes to that," Chris joked, adding that Lauren cooks and he cleans.
Prior to getting romantically involved with Chris late last year, Lauren had been engaged to former The Bachelorstar Ben Higgins and also dated a man whom she had met on Tinder, Devin Antin.
Lauren and Ben got engaged on The Bachelor's finale in early 2016, but after about a year together and a Happily Ever After? spin off on Freeform, the pair split in May 2017.
After Lauren moved out of Ben's home in Denver, CO, and headed back to California, she began dating Devin.
Lauren and Devin reportedly split in August 2018, and then Lauren got involved with Chris about three months later. Lauren and Chris had been friends for years but connected in a romantic way at one of his concerts.