Be careful when you walk outside today, folks. Neck tattoos are going around and I wouldn't want you to be the next to catch one. Last week, we showed you some photos of Vanessa Hudgens getting a "badass" butterfly tattoo on her neck. And over the weekend, Avril Lavigne shared some photos of herself doing the same. "I'm getting a f**ing neck tattoo," she tweeted on Saturday. "Its a...... Safety pin b**hes!!!!" How hardcore? [Huffington Post] After the jump, more stars with neck tattoos.