Unikitty from The LEGO Movie... Only realistic! I love imagining what cartoon characters would look like in reality! Since she has the hindquarters of a horse, she sits like a horse, and not like a cat. Go google pictures of horses sitting down, it's great.
Also note she's the size of a horse too.. which means her cute kitty paws are probably close to the size of a tiger's, with claws to boot... that unicorn horn looks really sharp... and at the end of the movie we learn that she can apparently unhinge her jaw and fly at super speeds when she gets angry.. To be honest she'd be terrifying in reality.