The girl on the book cover is my friend Cindy.  Her book comes 
out this August, so you should go out and buy it!  Cindy's a 
really cool gal, and I just wanted to give her book some 
publicity.  The book is about her Quinceanera.

Here's what Amazon.com had to say about it:

Synopsis:

  It's the biggest party of Cindy Chavez's life. In text and 
  gorgeous color photos, Elizabeth King takes readers to this 
  joyous, once-in-a-lifetime event, the "quinceanera". It is 
  the celebration of a Latina's 15th birthday--a coming-of-age 
  ritual in which a community welcomes its newest adult with a 
  church service, a feast, and dancing.