That one IS a fake, but there is such a thing as polymastia and similar birth defects...
"Supernumerary nipples (SNs) are a common minor congenital malformation that consists of nipples and/or related tissue in addition to the 2 nipples normally appearing on the chest. SNs are located along the embryonic milk line. Ectopic SNs are found beyond the embryonic milk line. The embryonic milk line is the line of potentially appearing breast tissue as observed in many mammals. In humans, the embryonic milk line extends bilaterally from a point slightly beyond the axillae on the arms, down the chest and the abdomen toward the groin, and is generally thought to end at the proximal inner sides of the thighs, although SN has been described on the foot.1 SNs can appear complete with breast tissue and ducts and are then referred to as polymastia, or they can appear partially with either of the tissues involved."
http://www.emedicine.com/derm/TOPIC735.HTM
In the interest of keeping to the intent of this forum, in most cases 2 are plenty
http://gallys.realitykings.com/bn/861/
