Wolf Cousins Studios (Stockholm, Sweden) and Unsub Studios (Los Angeles, California) Mixed at MixStar Studios (Virginia Beach, Virginia) Mastered at Sterling Sound (New York City, New York) Management When I'm Rich You'll Be My Bitch (ASCAP) – administered by WB Music Corp., – MXM – administered by Kobalt (ASCAP), WB Music Corp. on behalf of Warner/Chappell Music Scandinavia AB and Wolf Cousins (ASCAP), WB Music Corp. (ASCAP), Crown and Scepter (ASCAP), Unsub Pub LLC (ASCAP) – administered by WB Music Corp. –, Huncho YRN Music/Quality Control QC Pro/Universal Music Corp. (ASCAP), YRN Piped Up Entertainment/Quality Control QC Pro/Reservoir Media Music (ASCAP) and Silent Assassin YRN/Quality Control QC Pro/Reservoir Media Music (ASCAP) Migos appears courtesy of Quality Control Music Personnel Katy Perry – lead vocals, songwriter Migos – featured vocals, songwriters Max Martin – songwriter, producer for MXM Productions Shellback – songwriter, producer for MXM Productions, keyboards, programming, background vocals Oscar Holter – songwriter, producer for Wolf Cousins Productions, keyboards, programming Ferras Alqasi – songwriter Sam Holland – engineering Cory Bice – engineering assistant Jeremy Lertola – engineering assistant Peter Karlsson – vocal editing Daryl "DJ Durel" McPherson – vocals recording (Migos) Serban Ghenea – mixing John Hanes – mixing engineering Randy Merrill – mastering Credits adapted from the liner notes of Witness. Charts Weekly charts Year-end charts {| class="wikitable sortable plainrowheaders" style="text-align:center" |- ! scope="col"| Chart (2017) ! scope="col"| Position |- ! scope="row"| Belgium (Ultratop Wallonia) | 83 |- ! scope="row"| El Salvador (Monitor Latino) | 97 |- ! scope="row"| France (SNEP) | 198 |- ! scope="row"| Israel (Media Forest) | 44 |- ! scope="row"| Panama (Monitor Latino) | 86 |- !scope="row"| Ukraine Airplay (Tophit) |style="text-align:center;"| 184 |- Certifications Release history References 2017 singles 2017 songs Capitol Records singles Katy Perry songs Migos songs Song recordings produced by Max Martin Song recordings produced by Shellback (record producer) Songs written by Katy Perry Songs written by Max Martin Songs written by Shellback (record producer) Songs written by Ferras Songs written by Oscar Holter Songs written by Quavo Songs written by Offset (rapper) Songs written by Takeoff (rapper)