I was very casual on CS for the first few years, and didn't really pay much mind to Christmas rereleases... until I got Jessica.
Pet's name: Jessica
Back then in 2011, I didn't really understand what she was, but I knew she was cool. She doesn't seem to have been a Dec 18 rerelease, saying she was adopted on the 24th instead. Was the rerelease on a different day back then, perhaps?
Either way, she's been one of my favourites of my pet collection since then!