Liv Constantine is the pen name of sisters Lynne Constantine and Valerie Constantine. Lynne and Valerie are internationally bestselling authors with more than one and a half million copies sold worldwide.

Their books have been translated into twenty-nine languages, published in thirty-four countries, optioned for development in both television and film, and praised by USA Today, The Sunday Times, The Washington Post, People, Good Morning America, among many others. Their debut novel, The Last Mrs. Parrish, was a Reese's Book Club selection.