Britain's newborn princess has been named Charlotte Elizabeth Diana — seen as a tribute to Prince William's parents and grandmother.The princess is fourth in line to the throne after Charles, William and her older brother Prince George.Charlotte, the feminine form of Charles, appears to be a nod to the newborn's grandfather, Prince Charles. The middle names honor Queen Elizabeth II, the infant's 89-year-old great-grandmother, and the late Princess Diana, William's mother.