Newsround was at the Fame Academy for Saturday night's final and after she'd been announced as the winner, we grabbed a word with her.
Alex said: "Hopefully it won't go to my head. I'll surround myself with people who I love and who love me."
Top flat for the winner
As part of the prize for winning Alex gets to live in a posh London flat for a year, and will move in after enjoying a quick break back at home Cornwall.
A spokesperson for the BBC, who made the programme, said Alex would be spending the next few days helping to promote a Fame Academy album.