KSI went wild backstage as he watched little brother Deji grab his first ever boxing win.
The 25-year-old went into his 02 bout against fellow YouTuber Fousey having lost his previous three fights.
Deji defeated Fousey in brutal fashion
The 25-year-old dominated his light heavyweight bout
But he put that slump to bed, comfortably seeing off the American in brutal style.
Having already dropped Fousey with a jab, Deji ended the fight in round three by rocking his opponent with a big left – prompting the towel to be thrown in.
Watching backstage was headline act and big brother KSI, who had already defeated rapper Swarmz in his first fight of the night.
The 29-year-old had tipped his little brother to lose before the fight, so might have been pleasantly surprised as he watched Deji dominate.
In backstage footage, KSI looked transfixed as he nervously watched the closing stages.
He muttered “you’ve got this” before going wild with joy as the fight was stopped.
KSI screamed “yes!” repeatedly while jumping in delight, also smacking his gloved fists together.
Speaking about his brother’s success, he said: “Incredibly proud. This is one of the best moments of my life.
“For him to showcase his skill. He just took his time. Comfortably went in and out, jabbing and jabbing.
“He came through with the cross over and over repeatedly, punching Fousey in the face.
“Deji smashed it and I’m so proud of him – I’ve told him several times. I told him he had it in him.
“I told him he is up there with the best boxers in the YouTube scene and he showed it tonight. I am so proud.”
Following his triumph, Deji himself said: “I have the best team ever. I have Daley, the best boxing coach ever, ever.
“I have Leon, the best PT in the game and I have everyone out there showing their love. And that brought me out.”
After watching his brother’s victory, KSI easily went on to beat an awful looking Luis Pineda via third round TKO.
KSI easily defeated Luis Pineda
