How do I add a new virtual host to my apache?

Question

<VirtualHost mydomain1.com:80>
    ServerAdmin webmaster@localhost
   ...stuff here

</VirtualHost>

<VirtualHost mydomain2.com:80>
    ServerAdmin webmaster@localhost
    ...stuff here
</VirtualHost>

This doesn't seem to work.

Before, it was <VirtualHost *:80> and it worked.