A sister is a friend for life, and a friend can be a sister. Sisterhood is one of the most liked topics for the 3.5 million Happiness Is . fans on social media and this cute-ascan- be book captures 200 beautiful moments of sisterhood among friends and friendship between sisters. From sharing clothes and hosting parties to making pinky promises and staying close when you're far apart, this book says "I love you" in 200 different ways. Featuring the iconic illustration and charming captions of the beloved Happiness Is . brand, it's the perfect way to honor sisters by birth and sisters of the heart.