Who is Britain's Got Talent judge KSI? Net worth and more

Social media star and musician KSI is this year’s guest judge, joining the core four of Simon Cowell, Amanda Holden, Alesha Dixon and Bruno Tonioli.

The 31-year-old, who is also a YouTuber and boxer from Watford, is filling in for Tonioli due to scheduling conflicts for three audition days.

But who is KSI? And what has he said about his time on this series of Britain's Got Talent.

KSI attending the Britain's Got Talent launch at Sea Containers, London (Image: Ian West/PA)

Who is KSI?

Born Olajide 'JJ' Olatunji, KSI is an internet personality, musician and boxer.

From Watford, he found his fame on YouTube through his channel KSIOlajidebt, typically through the popular football video game FIFA.

He has since ventured into music, with his last album All Over The Place, debuting at number one on the UK Album Charts in 2021.

KSI has also been a part of several boxing fights, the latest of which saw him lose to Tommy Fury.

Our new Guest Judge @KSI is in the building!

Meet the social media superstar when Series 18 of #BGT launches this Saturday at 7pm on @ITV 1, @ITVX and @WeAreSTV. pic.twitter.com/8jGPwJY8aV

— BGT (@BGT) February 17, 2025

What is KSI’s net worth?

KSI has a net worth of $100 million, according to Celebrity Net Worth, which is just less than £80 million.

He has three solo YouTube channels and is a part of the YouTube group the Sidemen, which has four channels, altogether amounting to millions of subscribers and views.

KSI and American YouTuber and WWE star Logan Paul each have equity in the drinks brand Prime, which the pair founded in 2022.

Prime achieved sales of $1.2 billion in 2023, according to Bloomberg.

What is KSI’s role on Britain’s Got Talent?

KSI will be a guest judge on series 18 of the ITV show, standing in for Bruno Tonioli, who was absent for some of the audition tapings.

He said: “I did try to fill in Bruno Tonioli’s shoes.

“It was so fun. I just wanted to get as involved as possible and really immerse myself into the space and just enjoy it.

“And I thoroughly did, the auditions were incredible. There were some incredible singers… who just blew everyone away in front of that audience, it’s just incredible.”

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He added: “The whole situation, the whole moment, was fantastic, and my parents were buzzing.

“They can’t wait to watch. Even my friends are actually going to watch Britain’s Got Talent. There’s a lot of sick moments.

“There’s one moment which I know is going to come out and it’s going to go viral, and I’m going to hate it, but it’s very good.”

Britain's Got Talent 2025 returns on ITV, STV and ITVX on Saturday, February 22 7pm.