Best practice to integrate Asp.net Forms Authentication tables with my own domain tables?

I am creating a Asp.Net site which will accept users' registration/logon. The Asp.Net MVC automatically generate the following tables in a database with a strange name of aspnet-MyProjectName-20120705215524.
Is it possible to let Asp.Net Mvc generate the tables in my own database? (I have other tables which will refer the Users table). I will need the more columns in the table Users. Can I just manually add the columns to it? And I also want the extra columns show in the registration page.
...