Not many people living in Los Angeles these days have seen a cat actually giving birth. But thanks to the wonders of the intertubes, we have THIS VIDEO of a cat "queening".
While it's a wonderfully educational video, I do have one concern. Queening cats do far better if they are left alone in a dark, quiet place without humans or other animals around to disturb them. It is uncommon, but they have been known to kill and eat their kittens when overstressed by their presence.
The average litter size is 3 or 4, but I have personally seen a litter of 7 and I think more is not unheard of.
We still recommend spaying female cats at age 6 months to prevent pregnancy and greatly lower the risk of mammary cancer. In this economy, too few kittens are being adopted into good homes, so watch the video and have your own cat spayed before she can have any.