Kylie Jenner has officially turned 18 years old, it seems she has gotten tatted to celebrate. New photos of Jenner celebrating her birthday at an appearance in Montreal suggest the youngest of the Kardashian-Jenner sisterhood decided to sport a small red heart on her left bicep. Whether or not the ink is real -- or just a temporary party tat -- has yet to be confirmed. This wouldn't be the first time one of the young Jenner siblings got tatted, however. In June, Kylie's sister Kendall Jenner opted for a single white dot on the inside of her finger alongside friend Hailey Baldwin. Earlier this year, the 19-year-old model told Allure magazine that tattoos are against the advice of their big sister, Kim Kardashian. "My sister Kim always said, 'Don't put a bumper sticker on a Bentley'...I have a really weird thing about 'forever,'" she said.