chiacchierone

Etymology
From.

Noun

 * 1) chatterbox, windbag, prattler; one who talks excessively or incessantly (especially, but not necessarily, about trivial, vapid, superficial, insipid, or inane subjects)
 * 2) a gossip (person)
 * 3) loudmouth, bigmouth

Adjective

 * 1) talkative, loquacious