Adding Additional IPs to Existing Ethernet Interface

This is pretty straight forward, I just want to run through and verify the process before I do it, since my server lives in a data center across the country.

I'm currently hosting all of my websites on the same IP. I want to host two of the more popular ones on their own unique IP for several technical reasons. Configuring apache for this is easy, but I just want to verify how to add the second and third IPs to the system itself.

Is it a simple matter of clicking the [+] button (in System Prefs > Network ) and adding a new interface, on the same physical interface "Ethernet 1"? So I'd have 2, then 3 "Ethernet 1"s, each with a unique static IP? And these will all run in parallel without any issues? (assume they are all properly provisioned from my data center of course)