Charlotte also answered her critics, with Simon Cowell going so far as to retract his audition criticism. Simon Cowell admitting he got something wrong?! Is that pigs flying in the distance we can see?
Digital Spy caught up with Charlotte & Jonathan this morning for a quick Q&A about their victory and their hopes for Saturday's final.
You both looked shocked at winning last night. Were you the only people in the country who didn't think you were going through?
Charlotte: "You can't guarantee anything. You can cross your fingers and hope, but it's a public vote, so it was a definite surprise."
You didn't seem nervous during your performance. Were there any butterflies?
Charlotte: "How nervous was I backstage? He was sitting backstage chilling and I was panicking."
Jonathan: "I was trying to sit down as much as possible, breathing and relaxing."
Charlotte: "It was nervewracking, I'm just glad we managed to cover it up."
How do you think you will feel on Saturday with £500,000 at stake?
Jonathan: "A couple of hours before the semi-final, I felt as nervous as the audition. So I imagine it will be hugely nervewracking on Saturday. I can't even imagine it.
Charlotte: "Knowing the huge amount of talent on Saturday also brings with it some huge pressure. You have to come on after and before some really great acts."
Did last night's performance feel like vindication for sticking together after the audition?
Jonathan: "Personally, I felt justified sticking together before that performance. But I think the comments we got strengthened that and verified my decision."
Charlotte: "It was so nice for me to have that reassurance. I felt like I'd proved them wrong. Well, not even them, just Simon. To have him taking back his comment, I really appreciate that. I'd have been gutted if he'd said the same thing again."
What is driving you more - the £500,000 prize or the thought of a full-time singing career?
Charlotte: "The career, definitely. A lot of singers make money, but even more don't. You have to do it for the love of singing. It's not about the money. To be able to go out and sing, not do a boring day job and perform every night - that's the dream and what drives us on."
Is Susan Boyle an inspiration and role model for you?
"Charlotte: "Her success is incredible. I've wanted to go down the musical theatre route and that's what we want to do as an act. We can do solo and duo as well, we'll never restrict each other. We are open to everything, you don't want to pigeon-hole yourself and say that you want to be like them because you'll miss out on other opportunities that come your way."
Watch Charlotte & Jonathan's first audition:
Do you think Pudsey the dog could be your biggest rival?
Charlotte: "That dog is incredible. But we see everyone as competition. We can't underestimate anyone left in this competition. They are all really talented in their own field. They all deserve to be here."
Do you think you would have lasted in the competition without each other?
Jonathan: "I don't think so. We bounce off each a lot. When one of is nervous, the other one can help. It's really good."
Charlotte: "I couldn't imagine doing this on my own. I did one interview without Jonathan and I kept turning around to look for him. It was so strange that he wasn't there. I didn't know how to react without him to help me."
Jonathan, you've spoken in the past about bullying you've suffered. Will you be changing your look or your hair if you win the money and land a record deal?
Jonathan: "No, I'll continue to be me."
Charlotte: "The hair is you!"
Jonathan: "I'll continue being me and if people don't like that, I'm fine with it."
Charlotte: "You can't pay attention to the bad comments. You can't please everyone. The good comments far outweigh the negatives, so it's all been a confidence boost overall."
Britain's Got Talent's live semi-finals continue tonight at 7.30pm on ITV1.