You gotta hear this -- Marilyn Manson performed LIVE with the freaking DOORS this weekend for the Sunset Strip Music Festival in L.A. ... and he's a dead ringer for Jim Morrison.
Manson took the stage for the special performance Saturday night -- singing several Doors songs with the legendary rock band ... including "People Are Strange," "Love Me Two Times," and "5 to 1" ... and we gotta say, he crushed it.
Morrison died in 1971. Manson was just 2 years old. Pretty crazy.