she peed in the potty!

for the last few nights, as i've filled the bathtub for her evening bath, penny has asked to take off her clothes and sit on the potty.  she reads books, chats, and then gets her towel and gets into the bath.  tonight when she stood up, there was pee in the potty!  i don't know if she knows that she did anything, but we flushed it, sang a happy song, clapped, danced - it was a big celebration!  we'll see if it happens again.  i have never been so proud of anyone's pee before.....