The Hollywood superstar filmed a weigh-in scene for the movie shortly after Friday’s official weigh-ins for Jon Jones and Ciryl Gane’s heavyweight showdown.

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And a break during the prelim portion of the card served as the perfect time for the Hollywood cameras to use the octagon and film a fight scene.

Gyllenhaal took part in a full and authentic UFC walkout and was greeted by rapturous applause as he pretended to make his way to the octagon to fight for the middleweight title.

Gyllenhaal, 42, came out to ‘Enter the Sandman’, which got the fans going.

The champion – former UFC star Jay Hieron – came out to a slew of boos as ‘Many Men by 50 Ceny blared out.

It wasn’t long before Bruce Buffer was announcing the pair’s middleweight showdown, which was, surprisingly, well received.

Gyllenhaal, who plays Dalton in the remake of the classic film – in which he’s an ex-UFC fighter who ends up working as a bouncer in the Florida Keys – got off to a terrible start.

After avoiding some jabs early doors, he ate several blows against the octagon fence before landing thunderous hooks to the body to turn things around.

The champ was badly wobbled and ended up being dropped by a vicious knee.

Gyllenhaal – who will star in the film along with Conor McGregor – rained down blow after blow and the referee tried to pull him off.

A fired-up Gyllenhaal didn’t heed the refs’ intervention and continued to punish the fallen champ before being dragged off.

But he managed to land a final and unanswered blow – much to the shock of the crowd.

UFC fans were quick to comment on the scene, with one saying: “Dalton with the knee!”

Another said: “Nice to see him pull an Anderson Silva against the cage… though Anderson didn’t hit.

“Also DQ and Suspension pending.”

And another said: “Jake Gyllenhall finished Jay Hieron quicker than GSP and Woodley did.”

One remarked: “This is so fire.”

Another chimed in: “Well that’s a DQ.”

Roadhouse is set to be released later this year, although a date has not yet been announced.