Combs will wrap up his "Beer Never Broke My Heart Tour" in the city on Friday, and as he performed the first of two sold-out gigs at the country music mecca's Bridgestone Arena on Thursday, he decided to make it one to remember.
The singer first thrilled the crowd by introducing Rhett to collaborate on his track "Lovin' on You", but it was Urban's unexpected visit which really sent fans wild.
Combs was halfway through his rendition of "Hurricane" when Urban quietly stepped onstage to belt out the second verse and jam with his pal's band, much to the audience's delight.
The 29-year-old later took the opportunity to reflect on his rise to fame, after attending a Garth Brooks charity show at the same venue back in 2010 - before Combs had even started to pursue his career in music.
"Honestly, this has been more than I ever could have dreamed in my wildest dreams," he shared.
He later dedicated "This One's For You" to everyone involved in helping him put together his gigs.
Addressing fans, Combs said, "I want you guys to know that there are countless amounts of people, yourselves included, who work so much harder than I do every day to make sure this show happens every night."
"People from right here in Nashville who showed up this morning to build this stage and hang these lights up, the people scanning your tickets, the people pouring your beers, the people cleaning the bathrooms," he continued.
"Nobody ever gives it up for those people and they deserve just as much (recognition). And last but certainly not least is you guys. You came in here tonight and spent your hard-a** earned money to come and watch me play music, and that is not lost on me and will never be lost on me."