The 10 Most Successful  'American Idol' Contestants.

10. Clay Aiken Season 2 Runner-Up Net worth: $4 million

9. Scotty McCreery Season 10 Winner Net worth: $4 million

8. Elliott Yamin Season 5 Finalist, 3rd Place Net worth: $6 million

7. Chris Daughtry Season 5 Finalist, 4th Place Net worth: $8 million

6. Jordin Sparks Season 6 Winner Net worth: $8 million

5. Katharine McPhee Season 5 Runner-Up Net worth: $14 million

4. Jennifer Hudson Season 3 Finalist, 7th Place Net worth: $30 million

3. Adam Lambert Season 8 Runner-Up Net worth: $35 million

2. Kelly Clarkson Season 1 Winner Net worth: $45 million

1. Carrie Underwood Season 4 Winner Net worth: $140 million