Billie Paul Piper (born Leian Paul Piper; 22 September 1982) is an English actress, dancer, and singer, from Swindon, Wiltshire. She first appeared as a performer in Scratchy & Co. At the age of 15 she released her debut single "Because We Want To", which made her the youngest artist to enter at number one on the UK Singles Chart. Her debut album Honey to the B (1998) was certified platinum by the British Phonographic Industry. In 2000, she released her second album, Walk of Life. In 2003, she retired from the recording industry and began an acting career.
In 2005 Piper played Rose Tyler, companion to The Doctor from 2005 to 2006, in the BBC sci-fi series Doctor Who, reprising the role in 2008, 2010, and 2013. From 2007 until 2011, she starred as the high-flying escort Belle de Jour in the television series Secret Diary of a Call Girl. She also starred as Brona Croft/Lily in the Showtime series Penny Dreadful.
Piper has starred in five plays since 2007 and was given a Laurence Olivier Award for her performance in Yerma. She went on to win a total of six Best Actress awards for that one performance, including the Olivier Award, making Piper the only actor to have won six out of an available six Best Actress awards for a single performance.