Jennifer Phillips, from Camden, was originally planning to perform Beyoncé's 'Halo' but she was convinced by the panel to change her mind.
During her performance Phillips received a standing ovation from judges Rita Ora, Nick Grimshaw and Cheryl Fernandez-Versini.
When she had finished head judge Simon Cowell also got to his feet for the 49-year-old part time carer.
Rita Ora told the singer she "can't sit down" because she "just needed a constant standing ovation".
"To coin a phrase, you took us to church, girl," said Cheryl Fernandez-Versini. "I mean listen to them, they're going mad for you".
Nick Grimshaw added: "It wasn't even like an audition, I felt like I was at a Jennifer Phillips concert".
"It's a magical moment up here," said Phillips.
Simon Cowell told her it was also "magical" for him: "You define the word joy".
The second episode of The X Factor will air at 8pm on Sunday August 30.