I got a 10th villager not from friend or campsite?

[polytician]

My girlfriend and I share a town in AC, and she was walking around and noticed a space for a villager moving in. I looked and thought that someone had moved out but all 9 of my villagers are still there. I thought that wasn't possible, or am I mistaken?

 

[Zoe!]

You aloud ten villagers =)

 

[Reese]

You probably picked up a voided villager from someone you wifi'd with or streetpassed

 

[polytician]

oh cool. thanks.