Lauren sang a stripped back version of Whitney Houston's classic hit, 'How Will I Know', something which Cheryl Fernandez-Versini declared "the smartest audition we've had so far in this stage".
The judges called Lauren a "popstar" and Mel B was so ecstatic about the 16-year-old, she blurted out: "I am so excited right now I could slap you!"
Speaking to Reveal this morning (15 September), Lauren said she was worried about impressing Mel the most: "Obviously you don't want them to say anything bad but I think at the moment Mel B is the hardest one to impress.
"I was a little bit nervous about what she was going to say. Her comment was my favourite though! She also said, 'Thank you for coming down' and I was like, 'You're VERY welcome!'
For Lauren, it's still quite surreal to get such great feedback from the judges. "It's just really surreal hearing the comments," she tells us. "I think it's going to take a lot of time to get used to it. Four of the most iconic people in the music industry... they don't say that often. It's really crazy."
Lauren's arena audition in front of a 5,000-strong crowd at Wembley Arena didn't come without a few nerves too...
"I've never been in front of that big of a crowd before," she continues. "I was very, very nervous. I felt very small walking out on that stage! It got better though and I got into it."
Lauren decided to quit school to follow her dream but says the decision wasn't a hard one: "If I'm honest, I'm not academic. It wasn't a massively hard decision. I'm quite a chancer and I take a lot of risks but it wasn't as hard a decision as I thought it was going to be."
This isn't the first time Lauren has appeared on a talent show either: "I auditioned for Britain's Got Talent earlier this year and I got four yeses but in the end X Factor came up and I went for that instead! I thought X Factor would suit me down to the ground rather than BGT."
Now she's through to bootcamp, can Lauren go all the way? "It's a really strong year," she admits. "You've got to do your best and you've got to remember it's a competition, but to be honest, the other people deserve it just as much as I do. Everyone works really really hard."
With the judges having nothing but praise for her, Lauren remains focused on the competition: "I look up to people like Whitney Houston and Mariah Carey and I just want to be as good as I can be."
X Factor continues on Saturday and Sunday at 8pm on ITV.
Watch Lauren's audition here and tell us what you think below, as the best comment from across the website each week wins £50!