When she was asked why she never followed her passion for singing before, McGrath explained, "When I was younger, people would do that thing. 'Oh, you sound so amazing but you could be a little thinner. You could be a little taller.' So I never put myself out there like I should have. It’s been 25 years of me being an idiot and just getting inside of your head. It’s just too long, and it’s time."
Judge Simon Cowell quickly assured her, "It’s the people who judge people for all the things you said that are the idiots."
McGrath went on to blow the judges away with a powerhouse delivery of Gretchen Wilson's "Redneck Woman."
Update: Wilson was so impressed by the performance, she tweeted, "What an awesome performance and a beautiful lady! Can’t wait to see what she has next!"
Watch the full audition below.