Billie Jean: The Kid Is Not Not My Son

Billie Jean Jackson -- the other completely sane woman in court today claiming to be the baby mama of MJ's spawn -- just told us a "double negative" in the song "Billie Jean" proves Michael Jackson fathered Blanket with her.

Billie Jean Jackson: Click to watch
The song came out in 1983, Blanket was born in 2002.

Also, Billie has no idea what a double negative is.