Bill Hudson, father of Kate Hudson and ex of Goldie Hawn, has sealed a deal for a devastating tell-all book. He’s signed with California-based Dailey Swan Publishing to release “So You Are a Star: Coming to Terms With Fame, Infatuation and Family” this fall, Page Six has learned. The proposal teased, “What if your ex-wife used her public platform to spread rumors about your relationship with your children?” The book describes “his whirlwind romance . . . with Goldie Hawn,” whom he divorced in 1979, “and his struggle to rebuild a relationship with his children.”