Piano (see avatar). Pretty much my whole life. I play other keyboards as well (mainly Rhodes, and B3, but Clavinet and synths sometimes as well).
By the way, I disagree with the statement that you "become pro" after playing a paid gig. I'd say you're "pro" if you make a living off of if, or even if you gig very frequently. You don't automatically get that designation when you do the occasional gig, even if you get paid for it. By that definition, I'd have been "pro" since...hmm...grade nine, I think.