Jessica Alba says that she will never strip down and get naked for a movie, because her strict Catholic upbringing forbids it.  ABC News says:

Alba believes it is important to abide by her strict religious beliefs, even if it means losing out on blockbuster film roles.
The 26-year-old says, "I will never do a nude scene in a movie, not ever. I can act sexy and I can wear sexy clothes but I can't go naked. I think I was always very uncomfortable about the way my body developed.
"I come from a Catholic family and it wasn't seen as good to flaunt yourself. I can handle being sexy with clothes on but not with them off."

I'm pretty sure this story is like 4 years old and came about because the stripper she played in "Sin City" was supposed to be topless, but whatever, it still sucks.  Jessica Alba is so hot, I heard that when she walks down the street, people literally die.