Drew Carey -- BUSTS Collarbone, 'Price is Right' Postponed

Drew Carey was forced to cancel today's taping of "The Price is Right" -- after taking a NASTY fall during his morning run ... and separating his collarbone.

Carey tweeted ... "Had to cancel TPIR tapings today. I fell while running this AM and separated my clavicle. Be back tomorrow though!"

Drew even posted a picture of his x-ray -- adding, "Haven't even had a pain pill yet! (But I'm due. Still waiting on them)."