Jeff Bezos' fiancée, Lauren Sanchez, is being sued by her former yoga instructor over her new children's book, 'The Fly Who Flew to Space.'

Lauren Sánchez's new children's book is already a bestseller. But one particular Amazon review is getting noticed.

Jeff Bezos’ fiancee, Lauren Sánchez, is being sued by her former yoga teacher over her new children’s book. Wellness guru Alanna Zabel alleges Sánchez’s “The Fly Who Flew To Space,” which was published in August, is a rip off of her children’s book “Dharma Kitty Goes To Mars,” according to a lawsuit obtained by TMZ.