Stevie's album sales

[WildHearted]

Well, just talking US sales (what I Can find, anyway)...

Bella Donna - 4,000,000
The Wild Heart - 2,000,000
Rock a Little - 1,000,000
The Other Side of the Mirror - 1,000,000
Timespace - 1,563,000
Street Angel - 500,000
Enchanted - 172,000
TISL - 663,000
Crystal Visions - 348,000
Soundstage - 46,000
In Your Dreams - 188,000

Assuming that her albums like Bella Donna, The Wild Heart etc have sold some more since their last official certification, that puts her pushing almost 12 million in the US.

As far as other countries, this is all I can find -
In Your Dreams (countries other than US) - 312,000
Crystal Visions (Australia) - 35,000
Timespace (UK) - 100,000
TOSOTM (UK) - 100,000
Rock a Little (UK) - 100,000
The Wild Heart (UK) - 60,000

Which is like 700,000. But obviously, that's incomplete.

So based on this, I would think she would have at least sold about 15 million worldwide. But we may ~never know.