Singles:
baby one more time : 8,580,000
sometimes : 2,560,000
You drive me crazy : 3,995,000
Born to make you happy : 2,550,000
from the bottom of my broken heart : 1,000,000
Oops i did it again : 3,815,000
lucky : 2,611,000
stronger : 3,060,000
dont let me be the last to know : 412,000
I’m a slave 4 U : 1,800,000
overprotected : 940,000
i’m not a girl not yet a woman : 995,000
boys : 545,000
i love rock n roll : 380,000
anticipating : 36,000
Me agains the music : 1,998,000
toxic : 2,100,000
Everytime : 1,850,000
outrageous : 15,000
My pregorative : 768,000
Total Global single sales EST : 40 million

Albums:
BOMT: 24 million
OIDIA: 20 million
Britney: 11 million
ITZ: 7.4 million
GH: MP: 4 million
—————-
66.4 million albums sold

40 million+ 66 million = 106 million records sold

Thanks to BritneySFan for this info!