X Factor hopeful Melanie McCabe is singing to keep a roof over her family's head on Sunday's show.
The Dublin teenager, whose family are losing their home, is taking one last shot at fame after three previous failed attempts to win the hit singing show.
The 19-year-old said her audition in front of the judges - and an audience of thousands at Wembley Arena - was "definitely my last time".
She said: "I think it's the only thing I've ever been good at. I feel like the person I'm supposed to be when I sing.
"I can't even put it into words how much today means for me, it could significantly change my life and my family's life.
"My family have been so supportive of me over the years. We don't really have a lot of money, like as I'm sure most families don't, but we're losing our house at the moment and I'm kind of at this point in my life when I feel like everything is falling down around me and I just want something good to happen."
There is also a repeat performance for another act making a return bid for fame.
Jade Richards made it to the judges' house in 2011 and admitted this attempt was "make or break" for her as she prepared to sing in front of thousands of people at Wembley Arena.
The 23-year-old from Fife, Scotland, said: "I'm just a bit nervous, it's a big deal coming back again".