- Kelis – vocals, executive producer
- Ben H. Allen – engineer
- Wayne "The Brain" Allison – engineer
- Chris Athens – mastering
- Bangladesh – producer ; engineer
- Dawn Beckman – choir
- The Blitzburg Group – mixing assistant
- Printz Board – trumpet
- Renee Bowers – choir
- Jason "Poo Bear" Boyd – co-producer
- Renato Brasa – percussion
- Kerry Braxton – choir
- Robert "Brizz" Brisbane – engineer
- Jason Brown – choir
- Grecco Burratto – co-arranger
- Vadim Chislov – assistant engineer
- Nathan Connelly – assistant engineer
- Cool & Dre – producer
- Kevin Crouse – engineer
- Dickie – hair stylist
- Dr. Luke – producer, instrumentation
- Joseph Edwards – choir
- Damon Elliott – producer ; arranger
- Cheryl Evans – backing vocals
- John Frye – mixing
- Darien Gap – mixing
- Sean Garrett – producer ; co-producer
- Sharon Gault – make-up
- Serban Ghenea – mixing
- Jim Gilstrap – choir
- Conrad Golding – engineer
- Cee-Lo Green – producer, vocals
- John Hanes – Pro Tools engineer ; additional Pro Tools engineer
- Julio Hanson – choir
- Keith Harris – keyboards ; Rhodes guitar ; additional keyboards, Moog bass
- Jean-Marie Horvat – mixing
- Josh Houghkirk – mixing assistant
- J.Erving – executive producer, management
- Jake and the Phatman – co-producers
- Chad Jolley – mixing assistant
- Charles Jones – piano, keyboards
- Padraic Kerin – engineer
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- Markus Klinko and Indrani – photography
- Knobody – producer
- Marc Lee – engineer
- Andrea Liberman – stylist
- Mike Makowski – mixing assistant
- Fabian Marasciullo – mixing
- Max Martin – producer, instrumentation
- Renson Mateo – engineer
- Dave Mattix – assistant engineer
- Charles McCrorey – engineer
- Colin Miller – mixing assistant
- Wesley Morrow – production coordinator
- Bobby Ozuna – drums, turntables ; percussion
- George Pajon Jr. – guitar
- John Patrick – choir
- Joe Peluso – mixing assistant ; assistant engineer
- Dave "Hard Drive" Pensado – mixing
- Mark Pitts – executive producer, A&R
- Neal Pogue – mixing
- Polow da Don – producer
- Chuck Prada – percussion
- Sandra Riley – choir
- James Roach – assistant engineer
- Tim Roberts – assistant Pro Tools engineer
- Danny Romero – engineer, mixing
- Raphael Saadiq – producer, bass, guitar
- Tatsuya Sato – engineer
- Erika Schimdt – choir
- Smoke – rap
- Brian Stanley – mixing
- Scott Storch – producer
- Brian Sumner – engineer
- Phil Tan – mixing
- James Tanksley – assistant Pro Tools engineer
- John Tanksley – Pro Tools engineer
- Teddy "Bear" – co-producer, programming, keyboards
- Meneradini "Bridge" Timothee – piano, keyboards
- Too Short – rapping, engineer
- Denise Trotman – art direction, design
- will.i.am – producer ; clavinet, Moog bass ; drum programming ; synthesizer, drums ; keyboards, vocals
- Ethan Willoughby – mixing
- Doug Wilson – engineer
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