Lady GaGa succes: not to be sniffed at

GaGa stink in a bottle is selling well, apparently:

The reaction to FAME has been overwhelming. 6 million bottles in 1 week makes it the 2nd fastest selling fragrance after Coco Chanel.

— Lady Gaga (@ladygaga) September 22, 2012

Six million bottles in a week, eh? That's almost too good to be true.

In fact, it really does sound too good to be true.

In three months at the start of 2011, all the department store brands combined managed eight million units.

Is GaGa really not just outstripping the competition, but selling at something like ten times as fast?

Seems unlikely.

Is GaGa confusing the number shipped with the number actually sold?