I knew it couldn't be too far off. Finally, after a couple months of being able to remain sitting on her own and play comfortably, and weeks of going from sitting to lying down and rolling, my little girl tonight made it from lying on her back to sitting up! I was watching her play out of the corner of my eye and all of a sudden instead of being on her back or tummy, she was propping herself up with her arms and getting her legs from behind her to in front of her. It was quite the gymnastic effort.
I am so excited. Of course this means that crawling is right around the corner too (I was actually almost expecting her to do that today as well!), we've got some babyproofing in place but I'll have to get a lot busier on that front. Get all the cabinets secure, move all the hard, heavy stuff out of reach, add padding here and there.... oh boy.