Sarah, a 16 year old school girl and singer, closed tonight's first round of try outs for the new series.
Currently living with her mum and dad Alex in Milton Keynes, Sarah sings “And I Am Telling You” for the judges from the musical Dreamgirls.
After singing, Sarah had all four judges and the entire live audience up on their feet.
And before the cheering stopped, Simon upped the ante as he became the first judge to hit the golden buzzer this series, sending Sarah straight through to the live shows.
He said: "I've heard this song a lot and it started off really well and then it's like you became possessed halfway through.
"It was quite incredible and for someone of your age to stand on that stage with all the nerves and pressure to absolutely nail the song but you made it your song."
"I'm absolutely thrilled you got a golden buzzer," added Amanda Holden, "It was mind blowing, I can't believe you're only fifteen."
Alesha Dixon joked: "You're not allowed to have that much talent at your age! It's in sane! I want you to go far and I think Simon can help you because you're a superstar."
David Walliams added: "Yeah it was alright... No, it was fantastic Sarah, well done."
Finally, Simon concluded: "Most importantly, enjoy this, I'm thrilled for you and your family."
Britain's Got Talent 2017 continues Saturday nights on ITV.
The next episode airs next Saturday night from 8PM.