Speaking exclusively to Express.co.uk ahead of his performance, the 16-year-old said he feels “lucky” that his father Toby will be in the audience again tonight.
Dad Toby, who works overseas, surprised the teen after he showed up for his son’s first audition, leaving the singer-songwriter emotional as he performed.
Reuben’s father, who is a former commanding officer of the Coldstream Guards in Afghanistan, has flown back from Iraq for his second performance.
The schoolboy from Guildford, Surrey admitted that it was important to him that his father watching him live this evening.
He explained: “That means quite a lot to me because I didn’t realise he was going to turn up for my first audition.
“I know about this one, I didn’t know about the last one. I just feel incredibly lucky. I feel very proud,” he added.
Britain's Got Talent star Reuben Gray has spoken about the semi-finals
Reuben Gray's father Toby surprised him after turning up for his audition
That means quite a lot to me because I didn’t realise he was going to turn up for my first audition
Reuben Gray, Britain's Got Talent star
Reflecting on his nerves about the Britain's Got Talent semi-final, Reuben seemed pragmatic about the Britain’s Got Talent experience and said he was simply “proud to be here”.
“I don’t think you should get nervous because you’re performing alongside some incredible people and whether you get through or not, it’s the most incredible platform. I’m very proud to be here,” he said.
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Reuben went on to say: “I think you’ve just got to think of it as, ‘This is the point where you get to and if you don’t get any further, that’s fine’.
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Reuben Gray's dad Toby is back to watch him perform tonight
“Some incredible people haven’t got through. It doesn’t matter, it’s so important I’m looking forward to it.”
The piano-playing star got four yeses from the judging panel after he performed a self-penned song called Lifeline, which he revealed he wrote to successfully win back his girlfriend.
Reuben’s audition video has been viewed over seven million times on YouTube since it was uploaded back in April.
Tonight he will be facing off against John Parnell, Paws with soul, Angelicus Celtis, Jonny Awsum, Merseygirls, The Pensionalities and Ryan Tracey on the ITV show.
Britain’s Got Talent is on ITV tonight at 7.30pm.