Hollie first faced the red chairs during the blind auditions which were recorded in February, but almost didn’t make it.
“My ex actually signed me up without telling me,” they say.
“I got an email inviting me to audition which threw me a bit, because I had no intention of doing it.
“So I got thrown in the deep end.”
Hollie says they’ve never sung outside their bedroom, bar a few school shows, before taking the plunge on TV.
“It’s always just been a hobby rather than something I want to do in front of everyone else,” they say.
“But it’s nice to have affirmation that other people like it as well.”
Hollie was the last contestant to be picked by Sir Tom and, during the competition, he praised the sound and the “rare honesty” of Hollie’s voice.
Fellow judge LeAnn Rimes called their voice “tender”.