Was told I need front right wheel bearing replacement on 2007 Monte Carlo LT. Do I need to do an alignment as well?

Unless you are relatively certain that circumstances other than mileage caused your bearing failure, and depending on the current mileage, have the other bearing checked thoroughly. If you are able, replace both bearings, and have an alignment performed. Reputable dealers and repair facilities generally include an alignment with bearing replacement. Although you have more than likely shopped for a fair price, you may however wish to check the yellow pages on the internet for an alignment included in the repair. I prefer alignment shops that perform a high volume of suspension repair.