The 49-year-old singer shocked the world with her amazing voice when she auditioned for British talent show Britain's Got Talent.
Since then she has been nominated for a Grammy and topped the charts around the world with her two albums, I Dreamed A Dream and The Gift.
Cliff Dane from The Sunday Times List said: 'Unlike a lot of artists who write songs and have heavy touring commitments, most of Susan's income has come from old-fashioned record sales, mostly CDs as opposed to downloads due to the nature of her fanbase.
'I estimate she is currently worth £11million based on royalties and advances accumulated to date, fees from other sources less tax and including something for the present value of future royalty streams from her two albums.'