Source : Webster's Revised Unabridged Dictionary (1913)

Gossiper \Gos"sip*er\, n.
   One given to gossip. --Beaconsfield.

Source : WordNet®

gossiper
     n : a person given to gossiping and divulging personal
         information about others [syn: {gossip}, {gossipmonger},
         {rumormonger}, {rumourmonger}, {newsmonger}]