Kelly Ripa has been good friends with David Muir for years and the pair's friendship is incredibly solid. In fact, the Live with Kelly and Ryan star has paid a heartfelt tribute to David in her book, Live Wire.An extract from the book - which is released on 27 September - was posted on Kelly's Instagram Stories over the weekend, and the message is included on a page of acknowledgements.It read: "To David Muir, you are the backbone and moral compass I need sometimes." David has been hugely supportive about Kelly's book and even took it out with him when he went for dinner the other night.VIDEO: Kelly Ripa's love story with Mark ConsuelosHe took to his Instagram Stories to share a photograph of himself out enjoying dinner, and in his hand was Kelly's book.