ASP.NET MVC2 and Entity Framework 4 Generating Model from Database without duplicating Membership Models

I have an MVC 2 project where I recently consolidated the auto-generated membership/roles database with my primary database. I have an EF4 model generated from the primary database and it contains a table called Books. Now that I've consolidated the two, I setup relationships between Books and aspnet_Users so that I can see each user's books.

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The problem is that I want to update my EF4 model so that it represents this relationship, but I want to keep all of the generated membership code.

Is there anyway to do this?

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The solution is to not map the membership tables. Store the GUID or email address in another table. See the question comments for the detailed answer. Thanks @RPM1984 and @Craig Stuntz.