localhost redirecting to path specified for sub domain

In cakephp, I want to redirect localhost to app2 and client1.localhost to app1.

Instead both are redirecting to app1.

my httpd-vhosts is defined as:

 NameVirtualHost 127.0.0.1

<VirtualHost 127.0.0.1> 

    DocumentRoot "D:\wamp\www\cakephp\app2\webroot\

    ServerName localhost

</VirtualHost>

<VirtualHost www.myhost> 

    DocumentRoot "D:\wamp\app1\webroot"

    ServerName client1.localhost

    ServerAlias client1.localhost

    <Directory "D:\wamp\app1\webroot">

        Options Indexes FollowSymLinks Includes ExecCGI

        AllowOverride All

        Order allow,deny

        Allow from all

   </Directory>

</VirtualHost>

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