The singular Chelsea Handler — author, comedian, host, and icon — dishes all about her journey to turning 50 and the upcoming release of her new book, “I'll Have What She's Having” (out February 25th). Whether it was a crisis of confidence when she was at the very top, or bombing at a comedy showcase early in her career, Chelsea opens up about the life-changing moments that have shaped her into the fearless, bold woman she is today.