He's just a big softy!
Instead of making jokes though, the WWE star decided to show his vulnerable side, flashing back to his childhood and remembering his first love and the dog he had as a boy.
Just like the rest of the world, all these memories made the tough guy burst out and sing Adele's hit song, Hello!
But the nostalgia didn't stop there as Cena was joined on the show by his inner child — who apparently is none other than Troye Sivan. LOLz!
Ch-ch-check out the sketch (below) and find out what the wrestler does once he meets his younger self!