'Iron Man' Star Paul Bettany -- I've NEVER Seen an 'Iron Man' Movie!!!!

One of the guys who played a key role in "Iron Man" and "Iron Man 2" and "The Avengers" has made a shocking confession ... HE'S NEVER ACTUALLY WATCHED ANY OF THE MOVIES!Paul Bettany -- who got paid TONS of cash to provide the voice for Tony Stark's…