Celina Sinden is a British actress. Her acting career started when she performed in theater. During this period, she became a prolific stage actress. Some of the plays she had been in were Shakespeare’s Twelfth Night, Nicholas Nickleby and Blood Wedding. In 2010, she made her screen debut when she starred in the short film called My Neighbour’s Dog. A few years later, she auditioned for a role in The CW’s series Reign and successfully landed the part of Greer, one of Queen Mary’s lady-in-waiting. She became part of the show’s main cast from seasons 1-4, gaining her recognition.