Up is the new down

It seems all Natty Kat wants to do lately is pull up and stand, stand, stand. When I put her to bed the other night, I heard all sorts of thumping after I left the room. When I walked back in this is what I found:
So I pulled her out and waited for Jake to drop the mattress before she went back to bed. She still doesn't do the traditional craw and instead bear-crawls. All of these things (pulling up, standing, bear crawling) makes me wonder if we have an early walker on our hands?
I also have this video (click here) of Natalie using me as a jungle gym. It was taken about a week ago, but at one point (about 45 seconds in) she manages to get her legs under her to stand up. If I were to take this video again this week it wouldn't take her 45 seconds - she'd be upright in the flash of an eye!