Alec Baldwin -- White As a Sheet After Pap Scuffle

Now you see him, now you don't -- hours after Alec Baldwin got into a violent stand-off with a New York photog, the actor hit the streets of the Big Apple ... wearing a paparazzi-proof white blanket.

As we previously reported, things got physical between Baldwin and NY Daily News photographer Marcus Santos this morning -- as Baldwin was leaving a courthouse with his fiancee Hilaria Thomas. The couple had just obtained a marriage license.

Santos has already filed a criminal assault complaint against Baldwin, but the actor insists anything he did was in self-defense. The incident is currently under investigation.