We've all seen the classic mom tattoo—you know, the heart with 'MOM' scrolled across the middle (usually found on the biceps of biker dudes). Well, it looks like mom is being outshined these days by, drumroll please, grandma. Three of the biggest stars in the world are rockin' g-ma ink. Most of us honor our grandparents by letting them win at backgammon or eating dinner at 5:30 PM, but hey, a tat is just so much more, uh, permanent.