Just when you think Britney Spears couldn’t be any more insane, she decides to decline a duet with former flame/pop juggernaut Justin Timberlake.

JT reportedly penned the song in hopes that Britney would sing it with him; Timbaland would have produced it.

Add in the fact that Britney wouldn’t even have to be in the same studio as Timberlake to sing her part and voila - instant career-suicide. Between this and possibly joining the cast of Celebrity Apprentice, I am completely baffled by her brain-activity…or lack of.

The question begs to be answered: what is she thinking? Is she thinking? Does she honestly think that she will do better than doing a duet with the biggest pop star in the entire world and the best producer in the entire world?

Maybe her last duet turned her off to the whole concept.

The folks at Jive are “worried” about Brit’s batty behavior (who can blame them?). She is set to perform at the MTV Video Music Awards in September without a new hit song in her repertoire. So, for the umpteenth time, be ready to laugh (or cry) at Spears’ expense.