If you ask what is Britney's best albums, whether it was on ATRL or Britney.com, the top 2 answers are always: Blackout & In The Zone. Not sure many stans have seen this video, but you should, as the Queen of Pop shares with us a secret that not many people acknowledge.
In The Zone was recorded after her infamous break-up with Justin Timberlake, who has been there for here since day 1 at Star Search when she was 9. Blackout was recorded during the worst of Britney's years; let' not even go there. And both are - just like Britney explained in this video @3:31 - her best work.
So it's either sad Brit and extraordinary music, or happy Brit and good music.