After Corden and Clarkson belted out some of her most famous tunes like "Stronger," "Since U Been Gone" and "Love So Soft," the conversation turned turned to the singer's busy home life and the struggle to carve out one-on-one time with her husband.
"I think it's difficult because obviously I work a lot, and I'm a mom," Clarkson explained. "But we try."
"I feel like you might need to reconnect somehow," Corden said. "So I thought maybe we could arrange a date night for you and Brandon. Right now."
Corden pulled the car over and had the singer hop in the back, where he set up a small table -- complete with a white tablecloth, an assortment of chocolate confections and a red rose in a glass vase -- and then welcomed Blackstock into the backseat as well.
"Just pretend I'm not here," Corden whispered as he poured two glasses of champagne and was joined in the passenger seat by a violinst.
The couple -- who share two children, 3-year-old daughter River Rose and 1-year-old son Remington -- started the awkward-yet-sweet daytime date by locking arms to drink their bubbly beverages and then Blackstock adorably fed Clarkson a chocolate strawberry.
However, the singer worried that her usually shy husband would be a little awkward in the spotlight, a prediction that was hilariously proven true when Blackstock joked of the backseat date, "I feel like we're making a porn."
"Hang on, stop this," a laughing Corden told the violist as he turned to Blackstock in confusion. "Did you just say you feel like we're making a porn? That is not a romantic thing to say, Brandon! This is a romantic date night! Start again. Romance, romance, romance!"
Nervously, the adorable couple tried to make small talk before Blackstock -- in an attempt to talk about something less raunchy than filming a sex tape -- joked, "So I got a report from the farm today and they're, uh, workin' great."
As Clarkson laughed at her adorably awkward husband, Corden dryly quipped, "Tell us more about the report from the farm, Brandon. Way to keep the romance alive!"
The couple's mobile moment was only a short part of the lively "Carpool Karaoke," but it was a sweet look at their enduring real-life romance.
"I was single for a very long time, and it's hard when you're in the limelight [and] you're financially set and maybe they aren't -- it's just a lot of intimidation," the songstress said. “I'm a whole lot of person and I've dated people who are like, ‘You're a lot,’ and that's cool -- I am a lot but [I thought,] ‘Somebody is going to love that someday and it's not you, so that's fine.'"
However, the singer said that in Blackstock she "found a cowboy, a real man that can handle this." Check out the video below to hear more.