18/20. Unwritten, Promiscuous, I Still, Irreplaceable, SexyBack, Deja Vu, Hurt, U+Ur Hand, Who Knew, SOS, Hips Don't Lie, Invisible, Walk Away, Call Me When You're Sober. <3
I love Ashlee's songs, but I wouldn't have chosen them to be #1 of any chart of the decade. lol
19.- Natasha Bedingfield - Unwritten
17.- Daniel Powter - Bad Day
16.- A.F.I - Love Like Winter
13.- Nelly Furtado - Promiscuous
12.- Christina Aguilera - Hurt
11.- Backstreet Boys - I still...
9.- Evanescence - Call Me When You're Sober
7.- Shakira - Hips Don't Lie
5.- A.F.I - Miss Murder
2.- P!nk - Who knew
1.- Ashlee Simpson - Invisible