Ruth had originally auditioned for the 2010 series of the rival ITV1 show, getting huge praise from the judges for her big voice, despite looking like a 10-year-old girl!
But despite the compliments, Ruth's performance of Will You Still Love Me Tomorrow wasn't enough to keep her in the next round.
Will she fair any better on The Voice UK?
Ruth will be hoping at least one of the show's coaches - Jessie J, Sir Tom Jones, Danny O'Donoghue and Will.i.am - will like what they hear enough to press their buzzers and turn around.
Tune into the latest blind audition show on Saturday to see what happens...