Ester Dean is an American singer, songwriter, record producer, and actress best known for her role as Cynthia-Rose Adams in the musical comedy film Pitch Perfect. She is also credited as a co-writer of the song 'S&M' by Rihanna, and has written songs for many other artists including Christina Aguilera, Katy Perry, Nicki Minaj, and Beyonce. Dean has been referred to as the 'Dean of Pitch Perfect' due to her involvement in the film and its soundtrack.