Check your facts - there is nothing factually incorrect about my post.
Saying something is "last minute" and that "Britney is notoriously for recording last minute" and that she's done it for almost all her previous albums is WRONG. She has 6 previous studio albums. The first three were finished, mixed and mastered far before the first single was released to radio. The fourth was also finished completely, and the tracklist was finalised the week before the first single went to radio. These are FACTS. If you had followed her career as attentively as I have done since 1999, you'd know this, simply from remembering the press releases and electronic press kits that came out for each album.
Piece Of Me was one of the last songs she recorded for Blackout, but it wasn't 'last minute' at all. She was carrying a disc containing a lot of demo versions of songs that ended up on Blackout in February 2007 - months and months before the album was mixed and mastered. Teresa wasn't sure Piece Of Me was suitable, but Britney, having no management, decided to go for it. It was recorded, mixed and mastered before Gimme More was sent to radio, hence it appearing in early reviews of the album.
One report claimed Britney had gone back in the studio to record additional vocals for Womanizer, and that had delayed its premiere - most reports reported that it had been delayed "due to undisclosed issues with the mix." In fact, we never even had an official premiere date from Jive/Sony until they announced 29th September 2008, when it hit radio stations around the world. She was not recording for the album in October or November 2008 - the album was mixed and mastered, and a 4-track promo had been sent out with the final, finished, mastered mixes.
So, please, check YOUR facts. Recording tracks for the album - brand new tracks - as she is now, 3-4 weeks after the first single premiered, and just about 7 weeks from the album release date, is incredibly rare, and not just for Britney.