So, I was thinking about this in the shower today... there have been for different instances where Britney's latest release has been considered her comeback after her breakdown, Gimme More from the Blackout era, Womanizer from the Circus era, 3 when her Singles Collection was released, and now with the release of Femme Fatale's Hold It Against Me.
So, my question is, which song/era is really the comeback?