Former Us Weekly editor Janice Min has snagged a six-figure deal from St. Martin’s to write “From Mousewife to Momshell: The Rules and Celebrity Secrets for Being a Thinner, Younger and Sexier Mom.” The book’s due out in the spring of 2011. Min, mother of two, left Us Weekly last July after a six-year run in which she pumped circulation up from 1 million to 1.9 million by chronicling the pregnancies and post-baby weight losses of “Hollywood Momshells” Angelina Jolie, Gwyneth Paltrow, Nicole Richie and Halle Berry.