Do you have a younger sister? Do you often feel like she's way cooler than you are? If so, you're not alone. There could actually be a scientific explanation for why Solange Knowles's style is so different from big sister Beyoncé's, why Cara Delevingne's antics grab more headlines than her model sister Poppy, and why Kylie Jenner experiments more with her appearance than Kendall does.
Studies have shown that youngest children tend to be more free-spirited, creative, and rebellious. They are also more prone to attention-seeking behavior than their older siblings. According to Dr. Kevin Leman, a psychologist who has studied birth order since 1967, younger kids "get away with murder," as parents tend to be more lenient and tolerant after raising their first child. Because of this, little sisters are easily more outgoing, uncomplicated, and fun-loving. Does this sound like you (or your younger sibling)? Keep reading to see 12 celebrities who seem to live up to their little-sister roles.