Emerald Lilly Fennell is a British actress and author. She is best known for her role as Nurse Patsy Mount in the BBC drama series, Call the Midwife.
She starred in the Channel 4 sitcom Chickens with Simon Bird, Joe Thomas and Jonny Sweet. Then she joined the cast of the BBC One series Call the Midwife as Patsy Mount, after dying her blonde hair red. She is also known for her film roles in Anna Karenina (2012) and Albert Nobbs (2011).