Yes unfortunately,
From http://msdn.microsoft.com/en-us/library/y5a4ezk9.aspx :
βIn previous versions of Visual Studio, you could use Visual Database Tools to create tables, queries and views, and to create and maintain database charts. In Visual Studio 2013, the visual database tools are outdated, but the SQL Server database tools provide replacement features, To help you create tables, queries, and views, see SQL Server Data Tools (SSDT).
Neither Visual Studio 2013 nor SQL Server Database Tools replace database diagrams. You can use SQL Server Management Studio (SSMS) to work with database diagrams. SSMS is installed with SQL Server 2012 SP1 Express (Download Center).
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