Engineer [Assistant] – Alex Dromgoole, David Emery, Hart GuntherMixed By [Original Mix By] – Jeremy Healy, Paul Morris Mixed By, Producer [Additional Production] – Mark "Spike" Stent*Producer – The NeptunesProducer [Orchestra Produced By] – Ron FairProgrammed By [Additional Mix Programming], Keyboards [Additional] – Pete DavisRecorded By – Brian GartenVocals [Additional] – Talent Bootcamp KidsWritten-By – G. Stefani*, O. Hammerstein*, P. Williams*, R. Rogers*

Co-producer – Giorgio TuinfortEngineer [Assistant] – Alex Dromgoole, David Emery, Yvan BingFeaturing – AkonGuitar – Tony LoveMixed By – Mark "Spike" Stent*Producer – Aliaune "Akon" ThiamProgrammed By, Keyboards – Akon, Giorgio TuinfortRecorded By – Bojan Dugic*, Keith Gretlein, Kevin Mills, Mark "Exit" GoodchildWritten-By – A. Thiam*, G. Tuinfort*, G. Stefani*

Engineer [Assistant] – Hart GuntherMixed By – Rich TravaliProducer – The NeptunesRecorded By – Brian GartenWritten-By – G. Stefani*, P. Williams*

Engineer [Assistant] – Alex Dromgoole, David Emery, Ian RossiterGuitar – Mark RalphMixed By, Producer [Additional] – Mark "Spike" Stent*Piano, Keyboards – Tim Rice-OxleyProducer – Nellee HooperProgrammed By – Aiden Love*Programmed By [Additional Mix Programming], Keyboards [Additional] – Pete DavisRecorded By, Bass Guitar – Greg CollinsWritten-By – G. Stefani*, T. Rice-Oxley*

Backing Vocals, Co-producer – Sean GarrettEngineer [Assistant] – Alex Dromgoole, David Emery, Glenn Pittman*, Steve TolleKeyboards – Loren DawsonMixed By – Mark "Spike" Stent*Producer – Swizz BeatzProgrammed By [Additional Mix Programming], Keyboards [Additional] – Pete DavisRecorded By – Kevin MillsRecorded By [Additional Recording By] – Angel AponteWritten-By – G. Stefani*, K. Dean*, S. Garrett*

Engineer [Assistant] – Alex Dromgoole, David Emery, Dror MoharGuitar – Greg Collins, Matt BeckKeyboards – Gabrial McNair, Tony KanalMixed By, Producer [Additional Production] – Mark "Spike" Stent*Producer – Tony KanalProgrammed By – Neil Kanal, Tony KanalProgrammed By [Additional Mix Programming], Keyboards [Additional] – Pete DavisRecorded By – Andrew Alekel, Colin Mitchell, Greg Collins, Neil KanalWritten-By – G. Stefani*, T. Kanal*

Engineer [Assistant] – Ryan KennedyFeaturing – Pharrell*Mixed By – Phil TanProducer – The NeptunesRecorded By – Andrew Coleman , Brian GartenVoice [Baby Sounds] – Kingston James McGregor RossdaleWritten-By – G. Stefani*, P. Williams*

Engineer [Assistant] – Alex Dromgoole, David Emery, Dror MoharGuitar – Alex Dromgoole, David EmeryKeyboards – Gabrial McNair, Tony KanalMixed By, Producer [Additional Production] – Mark "Spike" Stent*Producer – Tony KanalProgrammed By – Neil Kanal, Tony KanalProgrammed By [Additional Mix Programming], Keyboards [Additional] – Pete DavisRecorded By – Andrew Alekel, Colin Mitchell, Greg Collins, Jonathan Merritt, Julian Chan, Neil KanalSaxophone – Angelo MooreWritten-By – G. Stefani*, T. Kanal*

Engineer [Assistant] – Alex Dromgoole, David Emery, Hart GuntherMixed By – Mark "Spike" Stent*Producer – The NeptunesRecorded By – Brian GartenWritten-By – G. Stefani*, P. Williams*

Engineer [Assistant] – Alex Dromgoole, David Emery, Dror MoharGuitar, Bass Guitar – Alex DromgooleKeyboards, Programmed By – Neil Kanal, Tony KanalMixed By, Producer [Additional Production] – Mark "Spike" Stent*Percussion – Anthony LoGerfoProducer – Tony KanalProducer [Additional Vocal Production] – Greg CollinsProgrammed By [Additional Mix Programming], Keyboards [Additional] – Pete DavisRecorded By – Andrew Alekel, Colin Mitchell, Greg Collins, Neil KanalSaxophone, Flute, Clarinet – Scheila GonzalezTrombone, Saxophone [Baritone] – Gabrial McNair, Stephen BradleyWritten-By – G. Stefani*, T. Kanal*

Engineer [Assistant] – Alex Dromgoole, David Emery, Jason FinkelMixed By, Producer [Additional Production] – Mark "Spike" Stent*Producer – The NeptunesProgrammed By [Additional Mix Programming], Keyboards [Additional] – Pete DavisRecorded By – Andrew Coleman Recorded By [Additional Vocals Recorded By] – Greg CollinsWritten-By – G. Stefani*, P. Williams*

Engineer [Assistant] – Alex Dromgoole, David Emery, Ian Rossiter, Kevin MillsGuitar – Martin Gore*, Richard HawleyMixed By, Producer [Additional Production By] – Mark "Spike" Stent*Producer – Nellee HooperProgrammed By – Ewan PearsonProgrammed By [Additional Mix Programming], Keyboards [Additional] – Pete DavisRecorded By – Greg Collins, Simon GogerlyWritten-By – G. Stefani*, L. Perry*

Bass Guitar, Backing Vocals – Gail Ann DorseyDrums, Percussion – Zachary AlfordKeyboards, Backing Vocals – Gabrial McNairKeyboards, Programmed By, Backing Vocals – Kristopher PooleyProducer, Recorded By, Mixed By – Guy CharbonneauWritten-By – G. Stefani*, P. Williams*