There is a widespread awareness in the American culture that women do not pursue careers in mathematics-related fields in equal numbers to men. Efforts to address this disparity by reforming mathematics education have met with some success; recent research shows that girls' achievements in mathematics stay on par with those of boys through secondary school. There still remains, however, a significant disparity between young men and young women's participation and success in mathematics at the postsecondary level, leading to what many now call the leaky mathematics pipeline. Researchers have examined women's experiences within the classroom and in professional settings in an effort to understand why and how young women become alienated from mathematics. The most recent manifestation of this work looks specifically at how the American culture constructs both gender and mathematics in ways that ensure that girls and women have a difficult time understanding themselves as mathematicians. In this article the author examines the relationship between the construction of femininity and the cultural understanding of rationality and mathematics and then uses the framework she develops to consider Danica McKellar's best-selling mathematics books for middle and high school girls, "Math Doesn't Suck" (2007), "Kiss My Math" (2008), and "Hot X: Algebra Exposed" (2010). (Contains 6 notes.)