X Factor singing sensation is currently in the Top 10 of the charts already, despite only auditioning for the show last night.
The 20-year-old performed her own track 'Last Night' for the panel, which she has previously released online for download.
Viewers have flocked to iTunes to buy the track, and it's now in the Top 10 and continuing to climb.
Lucy's previously released album, Top Room At The Zoo, is also doing well, and currently in the Top 10 of the album chart nearly a year after its original release last year.
Lucy took to Twitter to thank her fans this morning, writing: "I'm feeling pretty lucky right now. You guys are amazing, beyond amazing."
She added: "Remember that time I was in the Itunes chart?! WHAT THE HELL"
And with radio stations also jumping on the song, Lucy gushed: "#radio1?! No way. I am alone and I am laughing, laughing out loud on my own. I think I've gone insane."
In a bizarre twist of X Factor fate, Lucy's song is now in competition with Little Mix, who won last year's show.
The girls released their new single Wings today and its currently just ahead of Last Night at 4 on iTunes.