Musicians- Kelly Clarkson – lead vocals, backing vocals (2, 4, 5, 11)
- Carl Sturken – keyboards (1, 5), drum programming (1, 5), guitars (5)
- Rhett Lawrence – programming (2, 4), guitars (2), scratching (2), arrangements (2, 4)
- Clif Magness – keyboards (3, 6), acoustic piano (3, 6), programming (3, 6), acoustic guitar (3, 6), electric guitars (3, 6), bass (3, 6), arrangements (3, 6)
- Kenneth Crouch – organ (4)
- Matthew Wilder – acoustic piano (7), programming (7), guitars (7)
- Babyface – instruments (8, 9)
- Harvey Mason Jr. – instruments (8, 9)
- Louis Biancaniello – keyboards (10), programming (10), arrangements (10)
- Steve Mac – keyboards (11)
- Jeremy Ruzumna – organ (11)
- Doug Emery – keyboards (12), programming (12), arrangements (12)
- Jim Gasior – acoustic piano (12)
- Olle Romo – guitars (2)
- Tim Pierce – guitars (4)
- James Harrah – guitars (7)
- Corky James – guitars (8)
- Chris Camozzi – guitars (10)
- Pathik Desai – guitars (11)
- Paul Gendler – guitars (11)
- Fridrik Karlsson – guitars (11)
- Dan Warner – guitars (12)
- Tommy Sims – bass (4)
- Mike Elizondo – bass (7)
- Reggie Hamilton – bass (8, 9)
- Steve Pearce – bass (11)
- Randy Jackson – bass (12)
- Steve Ferrera – drums (1, 2, 4, 11), percussion (11)
- Josh Freese – drums (3)
- Abe Laboriel Jr. – drums (7)
- Teddy Campbell – drums (8)
- Lee Levin – drums (12)
- Wayne Rodrigues – scratching (2)
- Dave Arch – string arrangements (11)
- Cindy Mizelle – backing vocals (1)
- Evan Rogers – backing vocals (1)
- Suzie Benson – backing vocals (2)
- Danielle Brisebois – backing vocals (3, 6)
- Sherree Ford – backing vocals (4)
- Sharlotte Gibson – backing vocals (4)
- Lorenza Stopponi – backing vocals (5)
- Rebekah Jordan – backing vocals (7)
- Tamyra Gray – harmony vocals (8)
- Mary Griffin – backing vocals (10)
- Conesha Owens – backing vocals (10)
- Sam Watters – backing vocals (10), arrangements (10)
- Debra Byrd – backing vocals (11)
- Leslie Smith – backing vocals (11)
- Gina Taylor – backing vocals (11)
- Chris Willis – backing vocals (12), BGV arrangements (12)
- Aisha Wright – backing vocals (12)
- Betty Wright – backing vocals (12)
- Jeanette Wright – backing vocals (12)
Strings (Tracks 1 & 5) - Larry Gold – arrangements and conductor
- James Cooper III – cello (1, 5)
- Jennie Lorenzo – cello (1)
- Alexandra Leem – viola (1)
- Peter Nocella – viola (1)
- Daniela Pierson – viola (5)
- David Yang – viola (5)
- Charlene Kwas – violin (1)
- Emma Kummrow – violin (1, 5)
- Charles Parker Jr. – violin (1)
- Igor Szwec – violin (1, 5)
- Gregory Teperman – violin (1)
- Ghislaine Fleischmann – violin (5)
- Gloria Justen – violin (5)
Strings and French horn on "Before Your Love" - David Campbell – arrangements and conductor
- Suzie Katayama – orchestra manager
- Bette Ross-Blumer – musical assistance
- Joel Derouin – concertmaster
- Richard Todd – French horn
- Larry Corbett and Dan Smith – cello
- Bob Becker and Darrin McCann – viola
- Charlie Bisharat, Bruce Dukov, Berj Garabedian, Peter Kent, Michele Richards, John Wittenberg and Ken Yerke – violin
| Production- Clive Davis – executive producer
- Andrea Derby – production coordinator (1, 5)
- Jolie Levine-Aller – production coordinator (8, 9)
- Brian Coleman – production manager (12)
- Frank Harkins – art direction
- Brett Kilroe – art direction
- Tony Duran – photography
Technical - J.D. Andrew – engineer (1)
- Rich Balmer – engineer (1)
- Al Hemberger – engineer (1, 5)
- Rhett Lawrence – Pro Tools engineer (2, 4), mixing (2)
- Steve McMillan – Pro Tools engineer (2, 4), mixing (2)
- Olle Romo – Pro Tools engineer (2, 4)
- Jim Watts – Pro Tools engineer (2, 4)
- Andy Zulla – Pro Tools engineer (2, 4), engineer (11), mixing (11), additional recording (12)
- Clif Magness – engineer (3, 6)
- Csaba Petocz – engineer (7)
- Paul Boutin – recording (8, 9)
- Dave Russell – recording (8, 9), mixing (8, 9)
- Louis Biancaniello – engineer (10), mixing (10)
- Sean Tallman – engineer (10)
- Sam Watters – engineer (10)
- Matt Howe – engineer (11)
- Chris Laws – engineer (11)
- Robin Sellars – engineer (11)
- Carlos Alvarez – recording (12), mixing (12)
- Steve Churchyard – recording (12)
- Jules Gondar – recording (12)
- Craig Lozowick – recording (12)
- Dan Bucchi – assistant engineer (1)
- John Ishizeki – assistant engineer (1)
- Kevin Harp – assistant engineer (3, 6)
- Cesar Ramirez – assistant engineer (3, 6)
- Quentin Dunn – second engineer (7)
- Kevin Mahoney – assistant engineer (8, 9)
- Joel Sheppard – assistant engineer (8, 9)
- Daniel Pursey – assistant engineer (11)
- Cosbie Cates – second engineer (12)
- Jimmy Hoyson – second engineer (12)
- Jeff Kanan – second engineer (12)
- Greg London – second engineer (12)
- Marcelo Marulanda – second engineer (12)
- Doug Emery – additional recording (12)
- Conrad Golding – additional recording (12), second engineer (12)
- Dino Hermann – additional recording (12)
- Lee Levin – additional recording (12)
- Jeff Chestek – string engineer (1, 5)
- Gordon Goss – assistant string engineer (1)
- Vincent Dilorenzo – assistant string engineer (5)
- Tony Maserati – mixing (1, 4, 5)
- Dave Pensado – mixing (2)
- Bob Clearmountain – mixing (3, 6)
- Mike Shipley – mixing (7)
- Steve Ferrera – mixing (11)
- Brendan Kuntz – mix assistant (1)
- Matt Snedecor – mix assistant (1, 5)
- Jim Briggs – mix assistant (5)
- Pat Woodward – mix assistant (5)
- Dabling Harward – vocal editing (8, 9)
- Stephen Marcussen – mastering
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