make sure you turn it off if you havent already (you probably have). if you know how to take it apart properly, do so now. if not, grab some of that canned air & start blasting the shit out of it while also wiping it up with a towel. put a fan directly on it to help it dry faster.
you might be fucked though. spilled beer on mine & the keyboard never worked properly again, but it was alright. i just had to buy a USB keyboard.