From WENN.com

The TV matriarch, mum to socialites Kim, Kourtney and Khloe Kardashian, took to the social networking site on Sunday (21Oct12) to share a photo of herself in her Wonder Woman Halloween costume.

But her 2.5 million followers were left stunned after seeing the 56 year old's right nipple exposed as she posed in her low-cut red bustier.

Jenner apparently failed to notice her wardrobe malfunction, and instead sent a string of Happy Birthday messages to her daughter Kim, who turned 32 years old on Sunday.