Parasteatoda tepidariorum. A member of the cobweb weaver family (theridiidae.

Sometimes referred to as the common house spider and also American house spider.

A fairly common spider. This one is residing on my porch with another of the same species, as well as a brown widow. Don't have any shots of that widow. She only comes out at night and is very timid.

This photo isn't the best, but it's not so bad. Shows off her pattern ok, but quality is a bit noisy.