The Charlie's Angels star surprised fans on Thursday (27Aug15) 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!"

Her representative also confirmed to Us Weekly that the newborn was brought into the world "via gestational carrier", adding, "Mom and baby are healthy and happy."

Prior to Thursday's big reveal, Liu gave no indication she was planning to become a mum.