So my 05 coupe has about 90k and im starting to get a squeak from the right rear wheel. I did some research and came to the conclusion that its the wheel bearing. My question is should I only change the right rear one, or go ahead and change both?

Or could it possibly be something other then the wheel bearing?

 

This is pretty obvious, but did you check to make sure it's not a worn down brake pad?

 

How would a worn down pad make noise without the brake being pressed?

 

There are metal wear tabs on each brake pad. When the brake pad wears down too far, the metal tab rubs, or scrapes against the metal rotor and it makes a squealing or squeaking sound. The brake does not have to be pressed down for the tab to rub against the rotor and make that sound. Without seeing the cars break pads it's hard to tell, but if I had to guess, I would say it's simply a worn down brake pad.