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You could put a Polarizer on your lens, as well as a UV filter, but you may lose a couple of stops of speed...... and they have to be spotless.
Any extra glass (or plastic) put in front of a lens will degrade the image to some degree.
It also makes a difference with what kind of filters you mean - the screw-on glass filters, if clean, shouldn't be a problem..... square filters, on the other hand, can allow sidelight to creep between two filters and can deteriorate the image. I'm guessing you're using screw-on filters - I'd take the UV filter off if using a screw-on Polarizer.
Not a lot of point in having a polarizer for most portraits, unless you're outside and on a lake/river, or in bright sunshine (which is never great for portraits anyway)..... otherwise, I wouldn't bother.
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