- Gwen Stefani – vocals, creative direction
- Rusty Anderson – additional guitar
- André 3000 – keyboards, mixing, producer, vocals ; guitar, programming
- Bobby Ross Avila – guitar, keyboards
- Dallas Austin – drums, keyboards, producer
- Mark Batson – keyboard bass, keyboards
- Warren Bletcher – assistant engineer
- Chipz – programming
- Jolie Clemens – art direction, layout
- Andrew Coleman – engineer
- Lisa Coleman – keyboards
- Greg Collins – engineer ; mixing ; electric and slide guitar
- Sheldon Conrich – keyboards
- Cindy Cooper – packaging coordination
- John Copeland – logo, border and type illustrations
- Ian Cross – engineer
- Dr. Dre – mixing, producer
- Mike Elizondo – guitar, keyboards
- Eve – rap
- Nick Ferrero – assistant engineer
- Jason Finkel – assistant engineer
- Francis Forde – assistant engineer
- Nicole Frantz – art coordination, photography
- John Frye – engineer
- Brian "Big Bass" Gardner – mastering
- GMR – French spoken word
- Simon Gogerly – engineer ; programming
- Lee Groves – mix programming ; keyboards
- Cesar Guevara – assistant engineer
- Rob Haggett – assistant engineer
- Doug Harms – assistant engineer
- Peter Hook – bass
- Nellee Hooper – producer ; additional producer
- Ray Ibe – website direction
- Jimmy Iovine – A&R
- Mauricio "Veto" Irragorri – engineer
- IZ – drums, percussion
- Jimmy Jam – bass, producer
- Tony Kanal – keyboards, producer, programming, synthesizers
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- Rouble Kapoor – assistant engineer
- Kevin Kendricks – keyboards, piano
- Nick Knight – photography
- Jason Lader – programming ; additional engineer
- Terry Lewis – producer
- Sam Littlemore – programming
- Aidan Love – programming
- Matt Marrin – engineer
- Naomi Martin – backing vocals
- Wendy Melvoin – guitar
- Aaron Mills – bass
- Kevin Mills – assistant engineer
- Colin "Dog" Mitchell – engineer
- The Neptunes – producers
- Pete Novak – engineer
- Tomoe Ohnishi – illustration coordination
- Mimi (Audia) Parker – backing vocals
- Ewan Pearson – programming
- Linda Perry – guitar, guitar engineer, keyboard engineer, keyboards
- Glenn Pittman – assistant engineer
- Tony Reyes – bass, Line 6 guitar
- Ian Rossiter – engineer ; assistant engineer
- Seven – additional vocals
- Paul Sheehy – assistant engineer
- Rick Sheppard – engineer, MIDI, sound design
- Shinjuko – illustrations
- Jaime Sickora – assistant engineer
- Mark "Spike" Stent – mixing ; additional producer
- Bernard Sumner – backing vocals
- Cutmaster Swiff – cuts
- Sean Tallman – assistant engineer
- Phil Tan – mixing
- David Treahearn – assistant engineer
- John Warren – assistant engineer
- Mark Williams – A&R
- Brad Winslow – assistant engineer
- James "Big Jim" Wright – keyboards
- Zoey – backing vocals
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