Well, this is, as the gays say, just fabulous. The glorious M.I.A. took to Twitter on Saturday to (rightfully) bitch about having to open for Tenacious D, that funny-/fat-man band your younger brother likes, who replaced the ailing Beastie Boys at Outside Lands Festival.

MIA's gold nuggets of wisdom about having to open for Jack Black are as follows:

@_M_I_A_: "P.S I ORIGINALLY BOOKED ON SHOWS COZ BEASTIES WERE HEADLINERS , BUT NOW THEY AINT DOING IT AND I JUS WANNA SAY , WE HAVE TO GO HARD!!!"

@_M_I_A_: "CANT BELIEVE THEY REPLACED BEASTIES WITH TENACIOUS D ??????????????????????AND IF I PULL OUT THEY SUE! SO REALLY? TENACIOUS D AFTER ME ?"

@_M_I_A_: "SO ME AND JACK BLACK ARE BACK TO BACK, BEASTIES GET WELL SOON!"

ALL CAPS rage aside, she has a point. According to Spinner, M.I.A. "originally agreed to the show because the Beastie Boys were headliners and that now she'll just have to 'go hard.'" (We don't know what "go hard" means, but it doesn't sound good.) She ends her online rant by pounding on the keyboard, "YOUR ALL WELCOME ON STAGE FROM THE GET GO, FUCK IT! IM TAKIN BIRD FLU OUT OF THE SET ! JUS TO MAKE A POINT!"

You heard her, folks. Rush the stage on Sunday, or feel her fury unleashed.