Ryan O'Shaughnessy hasn't stopped smiling since getting through to the final and promised to trust his own talent and perform another one of his own songs.
One person who will not be there to support him is the girl who inspired the moving ballad, No Name, which wowed the judges in his audition.
Ryan said the pair had spoken on the phone and were "good mates" but she will miss the final because of exams.
"I think for the final I'll be more relaxed because I'm not really expecting anything. It feels amazing, it's a bit mind-blowing. I've had a permanent smile on my face since my name was called as the winner of the semi-final" he said.
Pop-opera duo Jonathan and Charlotte admitted they were ready to split up and go it alone when they first appeared on Britain's Got Talent.
The pair, who are hot favourites to win tonight's live final, resisted Simon Cowell's attempt to make Jonathan a solo act after their first audition.
But Charlotte said: "We had a conversation before and we were kind of like 'If they ask one of us to leave the duo how would we deal with it?"
"If they give you the choice and it is your actual choice, then OK, then stay together, but if it's kind of on your own or nothing then go, because why would you miss an opportunity like that?".
Britain's Got Talent judge Amanda Holden claims viewers are finally getting to see the real Simon Cowell.
She said the presence of Little Britain star David Walliams on the judging panel had brought out a different side of the show's supremo.
The actress said she was also enjoying working with Alesha Dixon on the ITV1 show, after Cowell poached her from her role on the BBC's Strictly Come Dancing.
Dixon herself said she would "love" to come back for the next series.
Jonathan & Charlotte - 5/6
Ashleigh & Pudsey 7/4
Ryan O'Shaughnessy - 7/1
Loveable Rogues - 9/1
Only Boys Aloud - 20/1
Sam Kelly - 50/1
Molly Rainford - 50/1
Aquabatique - 80/1
Kai & Natalia - 100/1
Source: William Hill