Spotify (05/31):

Blackout – 669,027
In the Zone – 600,991
Circus – 580,448
...Baby One More Time – 471,327
Oops!...I Did It Again – 456,017
Femme Fatale – 282,112
Britney – 192,655
Britney Jean – 134,895
Glory – 112,799

— Britney Daily Streams (@britneyonstream) June 1, 2021