The singer, 22, wowed the crowds this weekend with his rendition of With You from the musical Ghost.
While he has an impressive resume which lists Brit School and Centre Stage Theatre Academy, he’s also performed alongside a huge Hollywood name.
In 2019 Harrison took his talent to the Brit Awards where he joined Hugh Jackman on stage.
Dressed in a top hat and three-piece suit, Harrison performed The Greatest Show, taken from Hugh’s hit movie The Greatest Showman.
Sharing a photo of himself in the smart get-up he wrote: “Brit awards with @thehughjackman was brilliant. So happy I had this opportunity to do this. Many more things to come guys.”
His friends and family rushed to share their excitement for Harrison, with one saying: “So proud of you, you were amazing”.
Harrison’s BGT audition saw him sail through to the next round of the reality series with four yes votes.
Amanda Holden said he had acted the song “beautifully” while co-judge Bruno Tonioli praised the tone of his voice.
He said: “I love your voice there is a quality to it, especially in the lower register which is so rich and so deep and it’s very rare to get that quality.”
The security guard also appeared on Good Morning Britain with Susanna Reid and Richard Madeley to talk about the “setbacks” he faced in his singing career.
“My parents have supported me so much throughout training etc.
“I mean we are talking about Brit School and I have trained at Bird Academy, I went to a Centre Stage Theatre Academy, so I have done a lot.
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“They have been behind me the whole entire time.”
Harrison has never previously starred in any theatre shows on the West End or had a professional theatre job.
Prior to his appearance on GMB, Centre Stage posted a proud message on their Facebook page where they confirmed Harrison had been a student for 10 years.
But despite having no prior professional experience, GMB fans were quick to comment his background with many suggesting the show was ‘fixed’.
One person on X wrote: “So BGT is set up as we all knew then.”
A second put: “Really? Are we meant to believe about this Harrison audition on #BGT.
“All staged you ain’t fooling me and to be fair I’ve seen better.”
A third then wrote: “Like they didn’t know..utter rubbish..club singer.”
Yet others were quick to have his back.
One wrote: “Calling it now, Harrison is going to win the series.”
A second put: “The best act of the season so far by a country mile! Superb”
After his song on Saturday, another added: “Harrison literally just gave me goosebumps.”