Spotify (May 2021):

If U Seek Amy – 2,960,032
Sometimes – 2,260,874
Stronger – 2,150,400
Crazy – 1,949,945
Piece of Me – 1,932,508
Till the World Ends – 1,873,736
I Wanna Go – 1,869,862
Lucky – 1,864,935
Everytime – 1,655,074
3 – 1,521,068

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