It is second time lucky for Carolynne after she lost out at the judges houses section last year and she is determined to make up for that failure.
She said: "Last year was my nightmare year, probably the worst year of my life. I know what it feels like to get a no, and I know what it feels like to watch the show knowing that you could have been a part of it. It means the world for me to be here again."
The schoolgirl singer-songwriter, who has just finished her GCSEs, admits she is nervous about the live shows but staying positive.
She said: "I'd say I'm filled with excitement and I just feel like the luckiest girl in the world right now."
She impressed the judges with her first audition when she sang a song inspired by her late grandfather and she says she can only get better.
Ella said: "I believe that I have a lot to give and I'm fully dedicated to my music. I know that by doing this show I'm going to grow as a performer and my confidence will build up each week."
Location: Buxton, Derbyshire, but lives in Sheffield
Lucy caused a storm in her first audition where her performance of her own song, Last Night, got her a standing ovation and has been watched on YouTube more than 11 million times.
She said: "Every step of this process has been so overwhelming for me, from seeing the crowd reaction to my own song through to Tulisa giving me the yes at
Judges Houses, and now I just can't wait to show people what I can do on a live platform."
She has been gigging for the last few years as well as holding down different jobs including being a tour guide and a silver service waitress.
GMD3 (Greg, Dan and Mickey)
Age: 18, 19 and 18 respectively
Location: From Essex, Cleethorpes and Portcawl originally
The trio are hoping their "unity as a group" pulls them through the live shows.
The best mates met at school more than five years ago and have been together ever since.
Mickey said seeing other acts go on from the show and have huge hits inspired them to give it a go.
Dan admits they are nervous but said it is not because of the judges, saying: "All of them are absolutely lovely."