What happens when you put Carrie Underwood and Jimmy Fallon together? Apparently, you get the country duo Jim Carrie. Not to be confused with Jim Carrey -- actor of comedy fame -- Jim Carrie sings country music versions of popular rap songs. And they wear ridiculous outfits, too.

When the 'Good Girl' singer stopped by 'Late Night with Jimmy Fallon' this week, viewers got a lot more than they bargained for. In a previously-taped segment, Underwood and Fallon donned ridiculously bad country music get-ups, with the country singer dressed head to toe in denim (yes, even her cowboy hat looked like jeans) and Fallon sporting a Texas necktie and gigantic sideburns.

As seen above, they put together some awesome harmonies on country versions of 'Straight Outta Compton' by Ice Cube, Snoop Dogg's 'Nuthin' but a G Thang,' 'The Humpty Dance' by Digital Underground.

Of course, Underwood's interview wasn't all about remaking rap music. She chatted with Fallon about her concerts and noted that it's really hard to read complicated fan signs while she's singing -- but that didn't stop her from noticing a 'Be my first kiss' sign from a young Kentucky fan a few months ago. Being the sweetheart that she is, the country star called the boy on stage and planted one on him in front of the crowd.

"For all you people who are going to put this on YouTube later, this is going to happen once," Underwood said about the kiss. "Other signs from 45-year-old dudes have shown up in the audience... I'm like, 'I don't think my husband would want me to kiss you.'"

Before leaving, Underwood sang, rather than rapped, a smashing rendition of 'Blown Away' for the audience.

Watch Carrie Underwood on 'Jimmy Fallon'