Amber Heard is now a mother of three. The actor on Sunday wrote on Instagram that she has welcomed twins into the family, a son named Ocean and a daughter named Agnes. She shared the news along with a photo of their tiny feet."Becoming a mother by myself and on my own terms despite my own fertility challenges has been the most humbling experience of my life," Heard, 39, wrote. "I am eternally grateful that I was able to choose this responsibly and thoughtfully."Heard, who moved to Spain after the high profile legal battles with her ex-husband Johnny Depp, is also mother to a 4-year-old daughter named Oonagh. She wrote in the Mother's Day post that she is celebrating the "completion of the family" that she's strived to build for years.