Toddlers drinking coffee?

So a good friend of mine posted a picture on fb of her 2-3 year old daughter drinking from a coffee cup and in the comments she says that her little girl likes having a little bit of coffee.... I remember when her other child was around that age too and she'd give her a bit of coffee with mostly hot chocolate...

What do you think of this? Too much? The kid is pretty much drinking a weak mocha, but still... I personally think it's on the same page as giving your kid a coca cola: too much sugar and not healthy, but maybe a treat once in a while... but way to start your kid early on that caffeine addiction... maybe not the smartest move.