This is Natalie Okri. She was ten years old in this video and has a beautiful voice! Based on what I could find on YouTube, she performed this audition in 2009. She now has a YouTube channel with videos of herself singing.
The Daily Mail ran a story back in 2009 about Natalie being verbally and physically bullied at school during her time on Britain's Got Talent. Poor kid, I hope that she can let go of the bullying and make the most of her awesome talent!