Today my DS (4.4) went to the toilet, finished the toilet roll, put the empty roll in the bin, got a new one from the cupboard and put it on the holder, without being asked and without me in the room.
Also, my DD (2.0) counted up to 12 for the first time - she's been counting to 10 for a while and I never bothered trying to teach her any further so I was quite surprised.
I know they're only small things but they made me proud and make this whole parenting lark worthwhile 
What little things have your DC(s) done today to make you proud? Not big things like taking first steps or passing an exam. Little things that you wouldn't normally tell anyone about but now have an excuse to.