Question: Who was the partner of Alex Joseph "AJ" Pritchard on the seventh series of "Britain's Got Talent"?

full_context: Document 1: Joanne Clifton: Joanne Kirsty Clifton (born 24 October 1983), also known as Jo, is a British professional dancer, presenter, actress, singer. born in Waltham, Lincolnshire. She won the World Ballroom Showdance Championship in 2013 and also won the European Professional Ballroom Championship and World Dancesport Games. She has been a professional dancer on the BBC TV series "Strictly Come Dancing" since 2014, winning the Christmas Special in 2015 with Harry Judd who was series 9 champion and the fourteenth series in 2016 with Ore Oduba. Also appearing as an expert presenter on "" in 2015.
Document 2: Kevin Clifton: Kevin Clifton (born 13 October 1982) is an English professional dancer born in Waltham, Lincolnshire. He is a professional dancer on the BBC TV series "Strictly Come Dancing", having previously worked as an assistant choreographer. He has also featured on "Burn the Floor". He is fondly called "Kevin from Grimsby".
Document 3: Strictly Come Dancing (series 9): Strictly Come Dancing returned for its ninth series on 10 September 2011 with a launch show, with the live shows starting on 30 September and 1 October 2011. The show was broadcast from Wembley Arena on 19 November with all proceeds going to the BBC charity, Children in Need. The final took place at the Blackpool Tower Ballroom and was the first episode in 3D, and was shown on BBC HD and 18 cinemas around the country. As in series 8 there are 14 couples with one new male professional, Pasha Kovalev, replacing Jared Murillo.
Document 4: Tímea Papp: Tímea Papp (born in Kaposvár) is a Hungarian dancer and choreographer who can be recognized for her work in the Hungarian Film and Television Industry. Apart from graduating from both the Rotterdam Dance Academy and the Hungarian Dance Academy she participated in dance courses all around the world. Thanks to her knowledge and experience in many genres of dance from ballet through broadway and jazz all the way to contemporary dance she contributed to the success of award-winning feature films, theatrical productions like Chicago (musical), television shows such as Britain's Got Talent, America's Got Talent, Eurovision (Moscow, 2009 and Düsseldorf, 2011) and Fake Off in addition to advertisements and other creative projects worldwide. Since 2004 she has been working on developing a special technique where she combines dancing with videomapping projections to create an interactive choreography supplemented by visual elements. From 2009 using videomapping technique has been a kind of "trademark" in her work. She is currently the artistic director and choreographer of the dance team called Freelusion.
Document 5: AJ Pritchard: Alex Joseph "AJ" Pritchard (born 5 November 1994) is an English dancer and choreographer, best known as a professional dancer on the BBC One dance series "Strictly Come Dancing". In 2013 Pritchard auditioned for the seventh series of "Britain's Got Talent" along with his partner Chloe Hewitt and reached the semi-finals.
Document 6: Peta Hewitt: Peta Hewitt (born 1966) is the Australian artist best known for her YouTube channel (in 2015) and her long running science-fantasy series "Terinu" (both in print and on-line) (in 1996) for which she is both writer and artist.
Document 7: Dianne Buswell: Dianne Buswell (born 1989) is an Australian ballroom dancer. She has appeared on "So You Think You Can Dance Australia" and was a professional dancer on the Australian version of "Dancing with the Stars" in 2015. Buswell became a professional dancer on "Strictly Come Dancing" beginning in 2017.
Document 8: Ashley Banjo: Ashley Modurotolu Banjo (born 4 October 1988), is an English street dancer, choreographer and actor. He is leader of dance troupe Diversity, who won the third series of "Britain's Got Talent". Banjo was a judge on the Sky1 talent show "Got to Dance" and co-presenter of the Saturday night BBC game show "Can't Touch This".
Document 9: Brendan Cole: Brendan Cole (born 23 April 1976) is a New Zealand ballroom dancer, specialising in Latin American dancing. He is most famous for appearing as a professional dancer on the BBC One show, "Strictly Come Dancing". From 2005 to 2009, he was a judge on the New Zealand version of the show, "Dancing with the Stars".
Document 10: The Strictly: The Strictly is a signature dance routine from the BBC show "Strictly Come Dancing", which launched in the 13th series of the popular entertainment show. The dance was devised by "Strictly Come Dancing"'s Director of Choreography, Jason Gilkison and draws inspiration from some of the show's most iconic moves, as well as celebrating some of the show's stars.
Document 11: Bruno Tonioli: Bruno Tonioli (] ; born 25 November 1955) is an Italian choreographer, dancer, and TV personality.
Document 12: Mandy Moore (choreographer): Samantha Jo "Mandy" Moore (born March 28, 1976 in St. Louis, Missouri and raised in Breckenridge, Colorado) is an American choreographer who is well known for her work on "Dancing with the Stars" and on "So You Think You Can Dance", having appeared on seasons 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, , and 14. Moore was nominated for Emmy Awards in 2008, 2011, 2013, 2014, and twice in 2017. She won the Emmy Award for Outstanding Choreography in 2017 for "Dancing with the Stars" ("On Top of the World" and "Carol of the Bells" from Season 23). She has also choreographed duet and group numbers for "So You Think You Can Dance United Kingdom", "Canada", "Ukraine", and "the Netherlands".
Document 13: Chelsie Hightower: Chelsie Kay Hightower (born July 21, 1989) is a ballroom dancer. She is known for being a regular dance partner, trainer and choreographer on the ABC competition show "Dancing with the Stars", where she was a professional from Season 8 to 15, excluding Season 13.
Document 14: Strictly Come Dancing (series 7): Strictly Come Dancing returned for its seventh series on 18 September 2009 on BBC One. Bruce Forsyth and Tess Daly returned as presenters of the main show on BBC One, whilst Claudia Winkleman presented spin-off show "" on BBC Two. Len Goodman, Bruno Tonioli and Craig Revel Horwood returned as judges. Series 5 winner Alesha Dixon joined the judging panel as a replacement for Arlene Phillips. Darcey Bussell was a guest judge from the quarter final onwards.
Document 15: Chloe Hewitt: Chloe Hewitt (born 27 July 1995) is an English dancer and choreographer.
ground_truth: Chloe Hewitt