Stephen Colbert Shocks Maren Morris as They Sing National Anthem Together: 'Where Did That Come From?'

The late-night host performed 'The Star Spangled Banner' with the country singer.

Stephen Colbert and Maren Morris might need to take their act on the road! On Tuesday night's The Late Show With Stephen Colbert, the 34-year-old country singer was a guest for the first time. 

Detailing one of her earliest singing gigs performing the national anthem at amateur wrestling competitions in Texas, Morris shared she'd performed "The Star Spangled Banner" acapella. 

"Could I sing the national anthem with you sometime?" 59-year-old Colbert asked her. 

"Sure," she replied. 

"Because I know the baseline, I don't know the melody. I think you and I could be rocking," the late-night host mused. 

Maren Morris and Stephen Colbert sing national anthem on The Late Show. - 'The Late Show'/YouTube

The two stars then broke into an acapella duet, with Morris singing the melody and Colbert destroying the harmony. 

Colbert's impressive vocal stylings led Morris to look shocked throughout and even burst out laughing mid-way through. When they finished the track, "The Bones" singer asked Colbert, "Where did that come from?!"

Colbert grinned, telling Morris, "I want to sing that with you at an amateur wrestling competition… It's always good to have a fallback, this job could go away tomorrow."

In December, ET spoke with the "My Church" singer, who hinted that music would take a bit of a backseat in 2024, as she worked through personal things and found a way to channel her latest chapter.

"There's a lot of personal stuff right now I'm wading through, processing, writing through," said Morris, whose last album, Humble Quest, dropped in March 2022. "So, yeah, I'm giving myself the time to do that and not having to rush a very, huge personal thing through an album being delivered. So, yeah, it's going to take a little bit longer than I had hoped, but I have to trust the process."

Some of that "personal stuff" involved the 2023 split and subsequent divorce between Morris and Ryan Hurd. 

In February, documents obtained by ET confirmed that a Tennessee judge officially ended Morris and Hurd's three-year marriage and granted the pair shared custody of their 4-year-old son, Hayes. In the documents, Morris was listed as her son's primary parent and she and Hurd will each have him 182.5 days per year. Morris will also have to pay Hurd $2,100 per month.