I have a similar problem with several keys. I'm bringing it to the apple store today to see if they can do that. I don't want to do it myself, and possibly void the warranty. So I'll let the genius decide. (Plus I have a few other issues...)
Yeah, the mbp keys are designed to pop off. Bring it in. They will just pop it off and reseat it. If that doesn't work, they may just replace the key...or they could be a pain and say its cosmetic and no big deal. Only a visit to the bar will tell.