Between her debut and PRISM..

But i'm voting PRISM

Katy Hudson.

EDIT: One Of The Boys, out of the eligible albums. Not some saying her best album.

One Of the Boys, it's horrid.

One of the Boys

One of the Boys even though the singles are literally flawfree.

PRISM

Prism

PRISM by a good bit.

OOTB

One of the Boys.

PRISM ain't that special but there aren't any gems on her debut like Dark Horse and Walking on Air.

Prism, mainly because the singles of One of the Boys are flawless

One Of The Boys followed by Teenage Dream.

Prism.

The album has no cohesion. The first half all sounds like Teenage Dream rejects and then the second half sounds like a poor attempt to be taken seriously and sound mature.

Prism.

Most of Teenage Dream sounds like Prism rejects IMO

last few hours to get votes in before the artist changes

Kelly's worst album is.... ??

PBP is the only acceptable answer.