I've got a whopper too! He's 6 months and around 8 lbs... maybe end up 9-10 lbs full grown. It seems like he just exploded since I got him. My giant yorkie!!!
I might have wished for a smaller yorkie in the past but PK is the cutest little genius-brat and I'd have no other.
PK has papers, but I also wondered if he was mixed... he had wire hair for a long time but it's starting to soften. And he's so spoiled there's no doubt he's pure yorkie!