USA Swimming is Going For Gold In Carpool Karaoke

What happens when Michael Phelps, Katie Ledecky and Ryan Lochte pack into a car with their Olympic teammates? They break out in song, of course!

Before making the trip to Rio, Team USA cruised around Atlanta and rocked out to some of the biggest songs to date like "Party in The U.S.A" ... which they've obviously rehearsed many times.

Check out the video ... Let's hope they swim better than they can sing.