Past-Tense of the Verb "CC"

I commonly use the verb "CC" (carbon copy). I know I could use the word "copy" instead, but I prefer to say "CC" (pronounced see-see). For example, I might say (and have told my co-workers):

I will CC you on that email.

But what's the past tense of the verb CC? Is it "CCed" (which seems strange)? I find that to be strange, so I usually apostrophe it to "CC'd" (which draws more attention to the strangeness).

And no, I don't want to say "copied."

Please provide proof in the form of a similar case with a different strange verb (eg. google => googled).