Originally Posted By k12lts:
Rotate the tres and see if it's still there.
Probably not a wheel bearing if you recently had it aligned, the shop should have found it if there was a problem.
I just did a wheel bearing on a vehicle that had absolutely no play in the bearing. Noise was all that was going on. If it has leaked all the grease out it will make noise first, then get play in it.
If it is a front whee drive, jack up the front wheels, put it in drive and WITH OUT TOUCHING THE MOVING WHEEL grab the spring. If you feel the noise on one side or the other you have a wheel bearing.