Engineer [Assistant] – Alexis Smith, SubskrptInstruments [All] – John Hill , Switch Mixed By – Dan Carey, Switch Producer – John Hill , Switch Recorded By – Alex Leader, Eli Walker*Recorded By [Vocals] – Oscar RamirezWritten-By – Christina Aguilera, Dave Taylor, John Hill , Kalenna Harper

Engineer [Assistant] – Brian "B-LUV" Thomas, Matt BenefieldMixed By – Jaycen JoshuaMixed By [Assistant] – Giancarlo LinoProducer – Polow Da DonRecorded By – Jeremy Stevenson, Josh MosserRecorded By [Vocals] – Oscar RamirezWritten-By – Claude Kelly, Esther Dean*, Greg Curtis*, Jamal Jones, Jason Perry

Engineer [Assistant] – Matt BenefieldFeaturing – Nicki MinajMixed By – Jaycen JoshuaMixed By [Assistant] – Giancarlo LinoProducer – Polow Da DonProducer [Additional Vocal Production] – Claude KellyRecorded By – Jeremy Stevenson, Josh MosserRecorded By [Vocals] – Oscar RamirezWritten-By – Christina Aguilera, Claude Kelly, Esther Dean*, Jamal Jones, Onika Maraj

Engineer [Assistant] – Alex Leader, Alexis SmithInstruments [All] – John Hill , Switch Mixed By – Dan Carey, Switch Producer – John Hill , Switch Recorded By – John Hill , Subskrpt, Switch Recorded By [Vocals] – Oscar RamirezWritten-By – Christina Aguilera, Dave Taylor, John Hill , Mathangi Arulpragasam*

Engineer [Additional] – Kuk Harrell, Pat ThrallGuitar – Julio MirandaMixed By – Jaycen JoshuaMixed By [Assistant] – Giancarlo LinoPercussion – Juan Manuel Leguizamon, Pablo CorreaProducer – C. "Tricky" Stewart*Producer [Additional Vocal Production] – Claude KellyRecorded By – Andrew Wuepper, Brian "B-LUV" ThomasRecorded By [Assistant] – Luis Navarro , Randy UrbanskiRecorded By [Vocals] – Oscar RamirezTrombone – Alejandro Carbollo*Trumpet – Arturo SolarWoodwind [Alto, Tenor, Baritone, Snakes & Flute] – James KingWritten-By – Christina Aguilera, Christopher Stewart, Claude Kelly

Backing Vocals, Producer [Additional Vocal Production] – Claude KellyEngineer [Additional] – Pat ThrallMixed By – Jaycen JoshuaMixed By [Assistant] – Giancarlo LinoProducer – C. "Tricky" Stewart*Recorded By – Andrew Wuepper, Brian "B-LUV" ThomasRecorded By [Assistant] – Luis Navarro , Randy UrbanskiRecorded By [Vocals] – Oscar RamirezWritten-By – Christina Aguilera, Christopher Stewart, Claude Kelly

Engineer [Additional] – Pat ThrallMixed By – Jaycen JoshuaMixed By [Assistant] – Giancarlo LinoProducer – C. "Tricky" Stewart*Producer [Additional Vocal Production] – Claude KellyRecorded By – Andrew Wuepper, Brian "B-LUV" ThomasRecorded By [Assistant] – Luis Navarro , Randy UrbanskiRecorded By [Vocals] – Oscar RamirezWritten-By – Christina Aguilera, Christopher Stewart, Claude Kelly

Instruments [All] – TheRealFocus...*Mixed By – Manny MarroquinMixed By [Assistant] – Christian Plata, Erik MadridProducer – TheRealFocus...*Recorded By – Oscar RamirezWritten-By – B. Edwards Jr.*

Instruments [All] – TheRealFocus...*Mixed By – Manny MarroquinMixed By [Assistant] – Christian Plata, Erik MadridProducer – TheRealFocus...*Producer [Additional Vocal Production] – Detail Recorded By – Oscar RamirezWritten-By – B. Edwards Jr.*, Christina Aguilera, Detail

Arranged By [Strings] – Eric GorfainBass – Paul IllBass, Guitar, Keyboards, Percussion, Piano, Programmed By – Linda PerryCello – Abe Liebhaber, Diego Miralles, John Krovoza, Matt Cooker*, Richard Dodd , Stefanie FifeConcertmistress, Violin – Daphne ChenConductor – Christopher Anderson-BazzoliContrabass – Denise Briese, Jason Torreano, Richard WornDrums – Kellii ScottEngineer [Assistant] – Richard Brown , Thomas AiezzaEngineer [Pro Tools] – Kyle MoormanEngineer [Right Hand Man & Pro Tools] – Andrew ChavezMixed By – Manny MarroquinMixed By [Assistant] – Christian Plata, Erik MadridProducer, Recorded By – Linda PerryRecorded By [Vocals] – Oscar RamirezViola – Brett Banducci, David Sage, Jessica Van Velzen, Karolina Naziemiec, Rodney Wirtz, Tom TallyViolin – Alwyn Wright, Ami Levy, Amy Wickman, Anna Kostyuchek, Audrey Solomon, Cameron Patrick, Jennifer Takamatsu*, Marisa Kuney, Melissa Reiner, Neli Nikolaeva, Radu Pieptea, Sam Fischer*, Terry Glenny, Victoria LanierWritten-By – Linda Perry

Acoustic Guitar, Electric Guitar – Leo AbrahamsArranged By [Strings], Performer [Strings], Recorded By [Strings] – Oliver KrausBass Guitar, Celesta, Piano, Programmed By – Samuel Dixon*Drums, Percussion – Felix BloxsomMixed By – Manny MarroquinMixed By [Assistant] – Christian Plata, Erik MadridPiano – Larry GoldingsProducer – Samuel Dixon*Producer [Additional Vocal Production], Written-By – Sia FurlerRecorded By – Cameron Craig, Eric Spring, Samuel Dixon*Recorded By [Vocals] – Oscar RamirezWritten-By – Christina Aguilera, Samuel Dixon*

Acoustic Guitar – Leo AbrahamsAcoustic Guitar, Bass Guitar, Piano, Programmed By – Samuel Dixon*Arranged By [Strings], Performer [Strings], Recorded By [Strings] – Oliver KrausEngineer – Samuel Dixon*Mixed By – Manny MarroquinMixed By [Assistant] – Christian Plata, Erik MadridProducer – Samuel Dixon*Producer [Additional Vocal Production], Written-By – Sia FurlerRecorded By – Cameron Craig, Jimmy Hogarth, Samuel Dixon*Recorded By [Vocals] – Oscar RamirezWritten-By – Christina Aguilera, Samuel Dixon*

Acoustic Guitar, Electric Guitar – Jimmy HogarthArranged By [Strings], Performer [Strings], Recorded By [Strings] – Oliver KrausBass Guitar, Piano, Programmed By – Samuel Dixon*Drums, Percussion – Felix BloxsomMixed By – Manny MarroquinMixed By [Assistant] – Christian Plata, Erik MadridProducer – Samuel Dixon*Producer [Additional Vocal Production], Written-By – Sia FurlerRecorded By – Cameron Craig, Jimmy Hogarth, Samuel Dixon*Recorded By [Vocals] – Oscar RamirezWritten-By – Christina Aguilera, Samuel Dixon*

Mixed By – Jaycen JoshuaMixed By [Assistant] – Giancarlo LinoProducer – Polow Da DonProducer [Additional Vocal Production] – Claude KellyRecorded By – Bryan Morton, Josh MosserRecorded By [Assistant] – Matt BenefieldRecorded By [Vocals] – Oscar RamirezWritten-By – Bill Wellings, Christina Aguilera, Esther Dean*, J.J. Hunter, Jamal Jones, William Tyler

Featuring – PeachesMixed By – Manny MarroquinMixed By [Assistant] – Christian Plata, Erik MadridProducer – Le TigreRecorded By – Oscar RamirezWritten-By – Christina Aguilera, JD Samson, Johanna Fateman, Kathleen Hanna, Merrill Beth Nisker*

Backing Vocals – Claude Kelly, Esther Dean*Engineer [Assistant] – Jay Stevenson*Keyboards – Chauncey "Hit-Boy" Hollis*Mixed By – Jaycen JoshuaMixed By [Assistant] – Giancarlo LinoProducer – Esther Dean*Producer [Additional Vocal Production] – Claude KellyRecorded By – Cory Williams, Josh GudwinRecorded By [Vocals] – Oscar RamirezWritten-By – Christina Aguilera, Claude Kelly, Esther Dean*

Featuring – Nicki Minaj

Featuring – Peaches