Georgia Moffett Georgia Elizabeth Tennant ( née and credited as Moffett ) appeared as Jenny , the title character of the " Doctor Who " story " The Doctor ' s Daughter " . She has also done numerous audio jobs in various Doctor Who spin - off media : she voiced the roles of Cassie Rice for the animated " Doctor Who " serial " Dreamland " ( using an American accent ) , Alice Ciprion in the Sixth Doctor adventure " City of Spires " , Tanya Webster in the Big Finish Productions " Doctor Who " audio " Red Dawn " ( opposite her father ) and Vina Tallow in " Rule of the Eminence " , as well as recording audio versions of two BBC Audio BBC Tenth Doctor Adventures novels and doing voiceover work for Big Finish ' s " The Lost Stories " . She is the daughter of Peter Davison , who played the Fifth Doctor ( 1982 - 84 ) , and American actress Sandra Dickinson . Moffett began acting as a young teenager , and acted in numerous TV shows , often acting opposite her father . She was a regular on " " as ' s troubled teen daughter , who was featured in a number of major storylines . In 2004 she met with Russell T Davies and the producers to ask to be considered for the role of Rose Tyler , but they decided not to allow her to audition , because she was too young . In 2008 she auditioned for the role of Robina Redmond in the episode " The Unicorn and the Wasp " , but Russell T Davies asked her to wait as he felt she would better suit the role of Jenny . Since appearing on Doctor Who in 2008 , Moffett has acted in the short - lived spinoff " Spooks : Code Nine " and made four TV guest appearances ( in Casualty in 2009 and 2014 , playing two different characters ; " Merlin " in 2009 ; and a cameo in " Thorne " in 2010 ) . In 2010 , she landed the role of Emma in the BBC3 sitcom " White Van Man " , which was cancelled after two series . Also in 2010 she played a role in a one - act play , " Hens " , which ran for four performances at a fringe theatre in Hammersmith as part of a fringe festival . In 2012 she landed her first major theatre role , in " What the Butler Saw " ( which her husband David Tennant acted in 17 years earlier ) , playing the sexy secretary who the main character tries to seduce . The role required her to wear only lingerie throughout many of her scenes , which Moffett described as scary but liberating . Rehearsals started in March and the play started previews in May . However , it was not a critical or commercial success and the play was cancelled due to poor sales in July , a month before it was scheduled to finish . In late 2012 Moffett ' s father , Peter Davison , revealed that she had given up acting due to struggling to find work and her desire to focus on raising her young children . However she has acted sporadically since then . In 2013 , she recorded a role in a Doctor Who audio book " Dark Eyes " and appeared as herself in " The Five ( ish ) Doctors Reboot " ( written and directed by her father , and which she also produced ) . The same year her close friend actor Christian Brassington announced that he and Moffett were writing a film script together . In November 2014 , she will guest star in an episode of Casualty , her third guest appearance on the show ( playing a different character in each ) . Personal life . She was born nine months after Colin Baker took on role of the Sixth Doctor , replacing her father as the Doctor . Some years later she would attend the same boarding school as Baker ' s daughter . Moffett became pregnant at 16 ( she has never named the father publicly , only saying he was an older man who worked as a waiter at a restaurant near her boarding school ) , and gave birth to her son , Ty Peter Moffett , on 27 March 2002 . She began dating her " Where the Heart Is " co - star Adam Paul Harvey in February 2004 , moving in with him four months later , and he became a father to her son . They split in 2006 . Both Harvey and Moffett have stated that they consider him to be her son ' s father " in every way except biologically " and he maintains unofficial joint custody of the child . Ty attends stage school in London and has acted in a TV commercial , interviewed his mother for a video for the Doctor Who Official Site , and appeared with his mother and grandmother on a reality TV show . In 2013 Ty and his two - year - old sister appeared with their mother and grandfather in " The Five ( ish ) Doctors Reboot " , the unofficial 50th anniversary special written and created by Peter and Georgia . During his early childhood he frequently appeared with his mother in magazine and tabloid newspaper articles . After she started dating Tennant she stopped talking publicly about her personal life but started again once they were married . In summer 2008 , UK tabloids reported that she was dating David Tennant . In January 2011 , UK tabloids reported that they were engaged , with a wedding planned for 2012 , and that she was pregnant . On 31 March , UK newspapers reported that Moffett had given birth to a daughter , named Olive , earlier that week . She reportedly married Tennant in a secret ceremony on the 30 December 2011 , and no photos or details from the event have been made public . Moffett started going by Georgia Tennant privately the day of the wedding though she continues to use the name Moffett for her acting work . Tennant also adopted Moffet ' s son Ty ( from a previous relationship ) , and his name was changed by deed poll to Tennant . In January 2013 Jonathan Ross announced on his TV chat show that Moffett was pregnant again . She was photographed very heavily pregnant in April , and gave birth to her third child , a son named Wilfred , on 2 May 2013 . Moffett poked fun at her pregnancy during her appearance in the spoof " The Five ( ish ) Doctors Reboot " . Tennant has never spoken about their relationship publicly , ( though Tennant confirmed on 21 March 2012 during a promotional interview for his latest film that he had adopted Moffett ' s son ) , and they try to avoid being photographed together , for example by never walking red carpets together , entering and leaving venues such as theatres separately , and rarely attending events together . In November 2015 , Tennant announced on the Jonathan Ross Show that Moffett had recently given birth to a daughter , her fourth child . In July 2016 Tennant revealed the child ' s name was Doris .