Question: What was the birth name of the actress who portrayed Rose Tyler in the television series Doctor Who?

Context paragraphs:
Rose Tyler: Rose Tyler is a fictional character portrayed by Billie Piper in the British science fiction television series "Doctor Who", and was created by series producer Russell T Davies.  With the revival of "Doctor Who" in 2005, Rose was introduced as a new travelling companion of series protagonist, the Doctor, in his ninth and tenth incarnations.  The companion character, intended to act as an audience surrogate, was key in the first series to introduce new viewers to the mythos of "Doctor Who", which had not aired regularly since 1989.  Piper received top billing alongside Christopher Eccleston and David Tennant for the duration of her time as a regular cast member.  A regular for all of series one (2005) and series two (2006), Piper later returned for three episodes of the programme's fourth series (2008) and appeared in feature-length specials in both 2010 and 2013.

Billie Piper: Billie Paul Piper (born Leian Paul Piper; 22 September 1982) is a British singer, dancer and actress from Swindon, England.  She made her debut in "Scratchy & Co." (1995–1998), and at the age of 15, she signed a recording contract and released her debut single "Because We Want To", which entered at the top of the UK Singles Chart and made her the youngest artist ever to enter at number one on the chart.  The single was followed by Piper's album "Honey to the B" (1998), which was certified double platinum by the Recording Industry Association of New Zealand (RIANZ) and platinum by the British Phonographic Industry (BPI).  In 2000, she released her second album, "Walk of Life".  In 2003, she retired from the recording industry and launched an acting career.

Ninth Doctor comic stories: Ninth Doctor comic stories are those featuring the ninth incarnation of the Doctor from the television science fiction series "Doctor Who".  The Ninth Doctor's comic tenure was perhaps most notable for two things: the brevity of the run and the involvement of Rose Tyler.  No other Doctor had a run quite so brief as the Ninth and none used exclusively his televised companion; in fact, Christopher Eccleston's Doctor was the first since the Third Doctor (who debuted in 1970) to debut in comics with a televised companion.  This latter point was quite significant: no Doctor since the Third took his bow in "The Arkwood Experiments" had started his comic run with his televised companions intact.

Jackie Tyler: Jackie Tyler is a fictional character played by Camille Coduri in the British science fiction television series "Doctor Who".  The character, a resident of contemporary London, is introduced in the first episode of the 2005 revival as the mother of Rose Tyler, a travelling companion of the alien time traveller the Doctor.  Jackie is a recurring character during the 2005 and 2006 series of the show, and later makes one-off appearances in 2008 and 2010.  The character has also appeared in expanded universe material such as the "Doctor Who" New Series Adventures novels and the "Doctor Who Magazine" comic strip.

Martha Jones: Martha Jones is a fictional character played by Freema Agyeman in the long-running British science fiction television series "Doctor Who" and its spin-off series, "Torchwood".  She is a companion of the Tenth Doctor in "Doctor Who", after Rose Tyler (Billie Piper).  According to the character's creator and executive producer Russell T Davies in his non-fiction book "", the character was developed from the beginning with the intention of appearing for a whole of the 2007 series, and to later make guest appearances in subsequent series and crossover appearances in the show's two spin-offs; Martha subsequently made guest appearances in "Torchwood" series two and in "Doctor Who" series four in 2008 and special episode "The End of Time" in 2010.  Martha was also intended to make guest appearances in the 2009 series of "Torchwood" and "The Sarah Jane Adventures", but could not due to the actress's other obligations.

Adam Mitchell (Doctor Who): Adam Mitchell is a fictional character in the British science fiction television series "Doctor Who", played by Bruno Langley.  Adam is introduced in the first series of the programme's revival as the second television companion of the Ninth Doctor (Christopher Eccleston).  However, unlike the Ninth Doctor's primary companion, Rose Tyler (Billie Piper), who provided an effective human contrast to the Doctor's centuries-old alien, Adam was created to provide an example of an inept time traveller.

Pete Tyler: Pete Tyler is a fictional character in the British science fiction television series "Doctor Who", played by Shaun Dingwall.  He is the father of the Doctor's companion Rose Tyler (Billie Piper) and first appears in the episode "Father's Day".  Writer Paul Cornell incorporated characteristics of his own father whilst writing Pete.  This episode reveals that Pete died during Rose's childhood; though she attempts to change her past both she and Pete eventually realise that for the good of humanity he has to die.  Rose later takes inspiration from her father in a time of need.

Winner Takes All (novel): Winner Takes All is a BBC Books original novel written by Jacqueline Rayner and based on the long-running British science fiction television series "Doctor Who".  It was published on 19 May 2005, alongside "The Clockwise Man" and "The Monsters Inside".  It features the Ninth Doctor, Rose Tyler, Jackie Tyler and Mickey Smith.

Mickey Smith: Mickey Smith is a fictional character portrayed by Noel Clarke in the British science fiction television series "Doctor Who".  The character is introduced as the ordinary, working class boyfriend of Rose Tyler (Billie Piper), a London shopgirl who becomes a travelling companion to the Ninth and Tenth incarnations of an alien Time Lord known as the Doctor.  Mickey first appears in the first episode of the 2005 revival, "Rose".  Initially someone who struggles in the face of danger, Mickey nevertheless acts as an Earth-based ally to the Doctor and Rose.  In the second series he joins the pair as a second companion of the Doctor's, though leaves during the 2006 series to pursue his own adventures.  He returns to aid the Doctor and Rose in the series finale later that year, and then again for the 2008 finale "Journey's End," as well as fleetingly in 2010 in the Tenth Doctor send-off "The End of Time".

School Reunion (Doctor Who): "School Reunion" is the third episode in the second series of the British science fiction television series "Doctor Who".  It first aired on 29 April 2006.  The episode's narrative takes place some time after the events of "The Christmas Invasion".  In the episode's TARDISODE, Mickey Smith alerts the Doctor and Rose Tyler to a comprehensive school where strange things are happening, such as UFO sightings.  At the school, the Doctor encounters his former companion Sarah Jane Smith and the robotic dog, K9 Mark III, he sent her, who likewise were interested by the current events.  Together, they discover the force behind the events, a race known as the Krillitanes, and work to prevent them gaining control of the universe.  At the end of the episode, Mickey becomes the Doctor's new companion and joins him and Rose in their adventures.

Supporting paragraphs: Mickey Smith Billie Piper
Answer: Leian Paul Piper