The British teen, who initially admitted that she was "a little bit nervous", wowed the panel of celebrity judges with her performance of Otis Redding's Hard to Handle.
"Mr. Simon I had a dream about you", Sophie said.
The video of her audition has been viewed 16 million times. "The only thing I can do for you, young lady, is give you..." Rather than being put off by her, the crusty Cowell's heart melted, especially after she delivered a surprisingly polished version of the Frank Sinatra classic "My Way".
AGT•NBCAmerica's Got Talent The audience were visibly shocked when Courtney started singing
She won the title of the Mail's Performer of the Year at the Best of Hartlepool Awards last year.
Courtney is no stranger to talent shows - she also competed in The Voice Kids in 2017 and was mentored by McFly and McBusted star Danny Jones.
She left with a "Golden Buzzer" pass to the live shows.
For the rest of the song the audience are on their feet, as she belts out the 1968 song - and the performance finishes with a standing ovation from everyone in the auditorium.
The teen also appeared as part of the South Tyneside Festival summer concert line up in Bents Park in South Shields in July previous year where she entertained more than 18,000 people.
Supreme Court Upholds Ohio Voter Registration Law
He concluded that the OH system didn't violate the NVRA's failure-to-vote language since the state also sent the written mailers. Circuit Court of Appeals ruled in favor of OH resident Larry Harmon, who'd been removed from the state's registered voters list.