For last night's season finale, Mama Monster herself stopped by to lighten Lisa's moods and sneaks in a smooch with Marge.
I haven't seen the full episode, but from the looks of the sneak peaks, it should be Gagatastic. And it seems Lady Gaga's kiss has the power to cause extreme horniness and a drive to have sex with some one else.
Check out a second behind the scenes video after the jump. Matt Groening is wearing my glasses.