Kelvin Fletcher and wife Liz have had a busy few months and not just because they recently welcomed twins, but also because they're now releasing a new book.PHOTOS: Kelvin Fletcher and 12 more celebrities who live on farmsThe book will be titled Fletchers on the Farm, and will examine the past 18 months of their lives, which has seen them living on a farm with their children. The pair made the announcement on Instagram with a video that teased fans by making it sound like they were expecting another child.