Nope, not seeing a third nipple here. Some fans think it's a photoshop fail or...
Perhaps it's a lady bug and not a weird third nipple at all. Better keep comparing pictures.
And if you look closely, on her right knee, is a weird bump. A third nipple?! Let's compare pictures.
This is a girl with 3 sets of boobs running down her body, but each nipple is a dick and each underboob has a vagina so the nipple-dicks are fucking the underboob-vaginas above them. Also there's a dick in a teacup at the bottom.