According to a Drug Interactions checker on Drugs.com these two drugs have a 'moderate' interaction with each other because celexicob can increase the active level of percocet in your system (see below).  Your doctor should be aware of this so he can ensure that you're not taking too much. (On the plus side you may need less of the percocet :)). 

The Drug Interaction checker also states that it could miss an interaction so be sure that your doctor is aware of what you're taking (including any vitamins and herbs.)

Celecoxib may increase the blood levels and effects of oxyCODONE (percocet). If your doctor does prescribe these medications together, you may need a dose adjustment or more frequent monitoring by your doctor to safely use both medications. Contact your doctor if you experience increased side effects or if your condition changes. It is important to tell your doctor about all other medications you use, including vitamins and herbs. Do not stop using any medications without first talking to your doctor.