"They are my boyfriends"

For a long time, Brooklyn has referred to any other child as "her friend" (even if she saw them for the first time 4 seconds earlier while at the grocery store). Lately though, any boy she sees is her "boyfriend". I explained to her that all the other kids on the playground were her friends, and that yes, "some are boys and some are girls". She said, "No mommy, they are my boyfriends".