Squeaking coming from left side wheel

[rush91]

I've noticed the last few times I have driven my Z, a squeaking noise coming from behind me. It sounds like from the left side of the car. It almost sounds like a shock squeaking....It was happening on uneven pavement, but now its happing on every drive. I haven't had time to put her on jacks to take a look, I'm hoping its not something major. It happens in both backing up and regular driving. You can't hear it from inside the car, but if my window is down you can hear it....