It's CMA Music Fest week in Nashville, and with some of country's biggest stars all in one place, you never know who might just show up for a little jam session in the very earliest hours of the morning on Lower Broadway.

It might just be Eric Church.

The "Record Year" singer joined rising country star Charlie Worsham onstage during a Friday night/early Saturday morning show at about 1AM as a part of Worsham's Late Night Jamboree at Ernest Tubb Record Store on Broadway. The two jammed together in a room packed to the brim with fans as they collaborated on the Band's "Ophelia."

The Chief posted the video of the session on Facebook and noted just how hot the room was. He claims it was around 130 degrees, but we were not able to confirm.

Church and Worsham may have been a little warm, and they were definitely sounding hot. The two teamed together perfectly for the rendition, and they seemed like they were having a blast while doing it.

Worsham's Late Night Jamboree run kicked off Thursday night (June 9) and will conclude with a final show Saturday night (June 11). So far a whole slew of Music City's most talented stars have joined Worsham, and you never know who will be next.

In addition to Church joining in on the fun during Friday night's session, country artists Brandy Clark and Ryan Beaver stopped by to play a few tunes, too.

Thursday night's audience were in for a real treat as well, when surprise guests Vince Gill, Brothers Osborne and Aubrie Sellers took the stage alongside Worsham.

See Highights From Day 1 of CMA Fest