I use several referenced tables with integer primary keys. Now I want to change ints to GUIDs leaving all references intact. What is the easiest way to do it?

Thank you!

Addition

I do understand the process in general, so I need more detailed advices, for example, how to fill new GUID column. Using default value newid() is correct, but what for already existing rows?

sql sql-server foreign-keys primary-key guid
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