Kendall & Kylie Jenner, Ricky Martin

We just can't get enough of "Keeping Up with the Kardashians," especially the two youngest sisters, KENDALL & KYLIE JENNER! The sisters are following in their family's footsteps and have dominated the world of social media, modeling and reality TV. Kendall and Kylie join Ellen to tell her all about their book, "Time of the Twins: The Story of Lex and Livia."