David Ivor St. Hubbins is a fictional character in the mockumentary film This Is Spinal Tap (1984). In the film, he is the lead singer and rhythm guitarist of the mock rock band Spinal Tap. David is played by actor Michael McKean, who improvised the role through the whole film. McKean writes in his introduction to This Is Spinal Tap: The Official Guide, "When I am called upon to generate copy about the mostly fictional entity called Spinal Tap, I usually do so in the mostly fictional character of David St. Hubbins..."