Mason being a big boy!

So all of the sudden the other day Mason just starts taking his diaper off all the time! So I decide to get the little potty out- just in case- and buy him some "reward" snacks for his big boy jar, not really hoping for much. (Hayden & Tanner weren't potty trained until about 2y 9m and Mason is 2y 3m. ) So now he has gone ALL BY HIMSELF, w/out me asking or telling him, about 3 or 4 times, he just tells me "potty" or "sucker" and he goes in there and goes!! This morning he tells me- takes off his diaper and heads in the bathroom, stopping along the way to pick up a book for a bit of light reading I guess! Don't know where he got that from!