Courtney Love -- Guitar Hero 'Raped' Kurt's Image

Courtney Love is on the warpath -- threatening to "sue the s**t" out of the people behind Guitar Hero after she saw Kurt Cobain's image in the video game.

Cobain's widow just unleashed a serious Twitter attack on Activision -- the game developer -- saying they never got her permission to use Kurt's image ... and she wouldn't have given it to them if they had asked. Here's a sample:

"not in twenty JILLION years would i EVER have allowed this and this islethal."

"we get NO money for this, travesty, Frances gets NO money for the rape."

Love is no stranger to lawsuits ... we'll let you know when she takes this thing to court.

UPDATE: Activision released the following statement:
"Guitar Hero secured the necessary licensing rights from the Cobain estate in a written agreement signed by Courtney Love to use Kurt Cobain's likeness as a fully playable character in Guitar Hero® 5."