Shortly after the boxing legend passed away, Morgan posted a pretty shady comment, and both John Legend and Chrissy Teigen responded.
Piers fired back by insulting Chrissy's job, but Chrissy pretty much eviscerated him.
Piers then tried to garner some publicity for his latest column...
Piers and Chrissy kept going at it throughout the day, pretty much.
Who do you think won this one? Say what you will about the pointlessness of celebrity social media fights; if nothing else, they're always entertaining.