The 46-year-old actress surprised fans by announcing she is the proud mother of little Rockwell Lloyd Liu.
She took to Instagram to share a photo of herself holding the little one in her arms, adding the caption, "Introducing the new little man in my life, my son Rockwell Lloyd Liu. In love!"
Lucy has been linked in the past to businessman Noam Gottesman, actor Will mcCormack and writer-film director Zach Helm.