Billie Paul Piper (born Lianne Paul Piper on 22 September 1982) is an English actress and pop singer.

She began her career as a pop singer in her teens but is now best known for portraying Rose Tyler, companion to the Doctor in the television series Doctor Who from 2005 to 2006, a role she reprised in 2008. In 2007, Broadcast magazine listed Piper at #6 in its "Hot 100" list of influential on-screen performers, the top woman on the list.