Kendall Jenner -- I Got a New Accessory ... Nipple Ring!!! (PHOTO)

Kendall Jenner is officially attached ... to a nipple ring!

It was semi-apparent when the 19-year-old walked the red carpet before the ESPYs. There was a faint trace of what looked like metal balls in the nipple area.

Our Kardashian sources say it's the real deal. The 2 balls that were evident are the ends to a bar that goes right through her left nipple.

Turns out Kendall is following in her little sister's footsteps. Kylie got her piercing earlier this year.