Thanks everybody.

And to answer your question, we've seen Tubby grooming Peanut on her head, but she doesn't like it and only allows a few licks before the ol' swatter comes out and a scuffle ensues.

But the amazing part is that after they got up, Peanut was sitting on her "porch" (of her box) and Tubby was licking her head. I still had the camera in my hand, but had taken the card out in preparation of downloading the already unbelievable pics. So by the time I got the card back in and had it turned on, Tubby had gotten "the look" and had backed away from Peanut. I tried to push him towards her again, hoping he'd start licking her again, but no such luck. I thought it was so sweet that first they were snuggling, then it's as if Tubby wanted to say thanks for the snuggle, let me clean your head in return.
I bet your mommy almost fell downstairs trying to get to her camera!
You are so right, Sara! I made sure to hold onto the railing so I wouldn't stumble over myself. I was trying to be quiet and quick at the same time, which sometimes leads to making a whole bunch of noise and taking way too much time (by tripping).