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As shown in the clip, a fan from the crowd appeared to shout: "Oi Eddie, you p***y" in the direction of Hearn as he walked down the ramp behind Anthony Joshua.
The moment the comment is made, Hearn is seen swiftly turning around with an angry look on his face as he says: "What did you say? What did you say?"
He then followed up with: "Yeah, you s**t yourself now" as the crowd erupts with cheers.
It appears as if Eddie finished off his confrontation by calling the heckler a 'p***y' too, but it's not totally clear from the video that's what he actually said.
As expected, fans of Hearn were loving the viral footage that was posted by Twitter user @MichaelBensonn.
One user wrote: "How Eddie turned around and the guy had nothing to say no more."
A second user added: "Disgraceful behaviour from so-called fans. Fair play Eddie."
Whilst a third user joked: "Eddie in a bad mood because he has to explain to AJ he will be playing darts from now on."
Finally, a fourth user concludes: "Quite a big man is Eddie, bet he'd iron you out mate!"
And he isn't wrong! According to MDDailyRecord, Hearn stands at 6' 5" tall, which happens to be the same height as Joshua.
Although last night, the British boxer proved that size isn't everything as he lost his title belts to the smaller 6' 3" Oleksandr Usyk in a convincing win for the Ukrainian.
Usyk previously boxed at cruiserweight and dominated the division, resulting in him quickly jumping up to the heavyweight division.
In just his third heavyweight bout, Usyk beat Joshua via unanimous decision and became the new unified heavyweight champion of the world.
Joshua has since taken to Instagram to react to the loss.
He captioned his post: "Keep positive even if the world's crumbling in front of you!
"London I love you & thank you each and every time!"
The Ukrainian closed the show out in some style, dominating Joshua in the final round with combination punches and footwork that saw all of the Tottenham Hotspur Stadium standing on their feet.
Usyk is now the new WBA, WBO and IBF heavyweight champion of the world.
Featured Image Credit: Twitter/@MichaelBensonn
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