Aljamain Sterling, Chris Weidman and Justin Gaethje left STUNNED as Pena beats Nunes

Screams rang out and mouths were left fully agape as Julianna Pena pulled off one of the biggest shocks in mixed martial arts history to inflict a resounding defeat upon Amanda Nunes.

Leading up to the headline event of UFC 269 underdog Pena – who had backed herself heavily in the build-up to the fight – dismantled her opponent who is widely seen as the greatest fighter in women’s MMA history.

Pena pulled off one of the biggest upsets in mixed martial arts history to score a second-round submission win over Nunes and win the UFC bantamweight title, and watching on at the side of the Octagon a string of famous faces failed to keep their composure.

Aljamain Sterling (right) could not believe it when Julianna Pena pulled off the huge victory

A string of famous faces in the front row failed to keep their composure after seeing the fight

Michael Chiesa, Miesha Tate, Aljamain Sterling, Andrei Arlovski, Chris Weidman and Justin Gaethje were each picked up by the BT Sport cameras revealing their shock at the outcome.

Joe Rogan hailed the victory as ‘the biggest upset in the history of the sport’, as the masses were left stunned by what they had witnessed.

The former Ultimate Fighter winner pulled off one of the most improbable upsets in the history of the sport after tapping out Nunes with a rear-naked choke in the second round.

Julianna Pena pulled off one of the biggest upsets in MMA to defeat Amanda Nunes

Pena forced Nunes into a brawl, which allowed her to maximize the damage she was inflicting before taking the fight to the ground to wrap up the submission.

The stoppage came at 3:26 in round two as Pena snatches the 135-pound title away from Nunes.

‘I’m not surprised motherf*****s!’ Pena shouted into the cameras following her win. 

‘I told you. Don’t ever doubt me again. Will power strength and determination. It will take you places. I definitely expected a win and the world is my oyster.’