Unknown computer shows up in Finder, am I hacked?

H - got home tonight and notice a new Mac Book Pro icon under Shared in Finder. It is named "Lupin3d's Mac Book Pro" and it is "Not Connected". I don't see any option to connect to it.
I have a Mac Pro tower named "Mac" and I am certain no Mac Book Pro laptop has ever knowingly been on my network. There is a Windows machine also on the network but not named like that.
We live in an apartment building so this could be a Mac Book Pro in some other apartment in the building. We have wireless which has WEP enabled and a very long gibberish password.
My Mac Pro has bluetooth enabled for the mouse. I did not have Firewall enabled on my Mac Pro as we sit behind router NAT firewall so didn't think it was needed.
How is it possible this foreign MBP appears in my Shared list under my Finder window?
Am I compromised? Should I be concerned? I don't see how this Lupin3d MBP could possibly be on my machine unless it had gained access to my local network (having hacked WEP on the router?) which just seems really unlikely. Is there some easier way one Mac can connect to another without being on the same local network?
This is my first Mac, so please forgive the newbie questions, I'm not entirely familiar with attach vectors in Mac world. All advice gratefully received. thanks!

hi KT
thank you very much for replying
I ran who and it just shows my user name logged in twice (once for console, about the time i rebooted last yesterday, and once just now when i fired up Terminal). However I checked iTunes and yes, I have it set to Look for Shared Libraries. Do you think perhaps that is why I can see this unknown machine?
If it is iTunes, I'm still curious to know how my Mac can see the other Mac, when there is no network in common?
thanks again for your reply, i appreciate it
Adrian

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Unknown computer shows up in Finder, am I hacked?

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