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***WARNING: THIS ARTICLE CONTAINS SOME EXTREMELY GRAPHIC CONTENT***
Seriously, even though there's a clear warning at the top of this article. The photograph below isn't for the faint-hearted or squeamish among you.
The British fighter suffered a ridiculously bad split to his upper lip during the scrap, which he lost via a fifth round knockout against the Surinamese athlete.
It looked like Overeem was going to take the points decision, but then he was blindsided with just four seconds in the fight, and left with a brutal injury to his lip.
That was enough to send Overeem crashing to the mat and slumped against the side of the octagon wondering where it all went wrong.
That's presumably before the adrenaline started to wear off and he began to wonder where the rest of his gob went.
Referee Dan Miragliotta officially waved the bout off with two seconds left on the clock once he'd seen the damage done by Rozenstruik's powerful one-two combination.
Afterwards, the London-born 'Demolition Man' tweeted to confirm that he was getting the treatment he needed.
That doesn't sound that great, however.
He said: "Getting stitched up. Lip not to sexy at the moment.. a little bit a fast stoppage if u ask me - but hope u guys enjoyed the fight."
That means that his two match winning streak is over, and he now holds a record of 45 wins, 18 losses and no draws
Meanwhile, his opponent and the victor hopes to get a second crack at the heavyweight strap before he calls time on his career.
After this fight, Rozenstruik called out fellow heavyweight knockout artist Francis Ngannou. That would certainly be an explosive bout between two men who punch like freight trains.
As for the decision to call the fight off, even that has come under scrutiny from UFC fans.
A lot are unhappy because Overeem got up straight away and could have easily lasted the four seconds remaining, with a points decision likely to go in his favour.
One person wrote: "Except Alistair got up right away and the ref stops the fight when Overeem isn't being attacked and round was up in 4 seconds."
Another said: "Bit odd. Overeem was straight up. But the fact the other guy didn't follow in with ground and pound as they usually do tells me he knew it was done."
A third added: "Why did the ref stop the fight!? Overeem got up straight away. Well, he might have got up, but part of his lip was almost certainly still on the canvas, some distance away.