It's hard to tell from the snapshot exactly what the tattoo is, but it takes up most of the teen's forearm.
Also unclear is whether or not the design is a permanent addition. Kylie and her older sister Kendall are both known to be fans of temporary tattoos.
Earlier this year, the pair posted pictures on their Instagram pages of their wash-away body art — Kylie showcasing a gun design on her ribcage, and Kendall an antelope head on her finger.
Kylie has perhaps been inspired by another sister, Khloe Kardashian, when it came to the placement of her latest design.
Khloe, who has a number of tattoos, has the words 'I Love You' in her late father's handwriting inked on her wrist.
Kylie and Kendall have recently started to emerge from the shadows of their older sisters. While Kendall has been carving out a name for herself in the fashion world — she recently walked in Marc Jacobs Fall 2014 show — Kylie sees her future in design or acting.
"Right now I love designing and I want to pursue that career once I turn 18," the pretty brunette recently told Marie Claire Mexico. "But acting is something I would regret not giving a chance when I'm older, so I would love to try it and see if I like it."
She might have the world at her feet, but Kylie still shares the same dreams as other girls her age.
Speaking to Seventeen Prom magazine, she admitted, "I don't have a boyfriend, but I do really want that boyfriend prom experience.
"I would want to go with someone who's not afraid, or doesn't think that he's too cool, to show up at my house with a rose corsage.
"It would be nice for the guy to come over and be respectful and nice while my mum takes prom pics."
She added, "But if I couldn't find a boyfriend, I would want to go with one of my best guy friends, like Jaden (Smith). I know I'd have fun with him — he makes me laugh and he's a great dancer."