Wearing only a cardboard cut out of a car, James Corden put together, what many are calling, the most viral moment of the night! Along with Tim McGraw, Faith Hill, John Legend, Chrissy Teigan, Jennifer Lopez, Keith Urban, Jason Derulo, Ryan Tedder & Neil Diamond... James lead the group in singing Neil's famous hit "Sweet Caroline" and had the entire arena singing along. 

But let's be clear, that was NOT the best part. 

Just after hitting the main chorus, Beyoncé's adorable baby girl Blue Ivy decided she wanted to be a part of the Carpool Karaoke fun and stepped in. Of course everyone went crazy! 

Check out the video below: