Question: What is the nationality of the woman who partnered with Jay McGuiness in the 2015 BBC dance series "Strictly Come Dancing"?

Context articles: AJ Pritchard
Strictly Come Dancing
Aliona Vilani
Katya Jones
Giovanni Pernice
Gorka Márquez
Strictly Come Dancing: It Takes Two
Trent Whiddon
The Strictly
Jay McGuiness

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.
Strictly Come Dancing (informally known as Strictly) is a British television dance contest, featuring contestants, celebrities, and other people, from all walks of life, with professional dance partners competing in a ballroom and Latin dance competition.
 Each couple is scored out of 10 by a panel of judges.
 The title of the show suggests a continuation of the long-running series "Come Dancing", with an allusion to the film "Strictly Ballroom".
 The format has been exported to over 40 other countries, and has also inspired a modern dance-themed spin-off "Strictly Dance Fever".
 The show is currently presented by Tess Daly and Claudia Winkleman.
Aliona Valeriya Kavanagh (née Vilani on 1 May 1984, Russian: Алёна Валерия Вилани ) is a Russian-Kazakh professional dancer.
Katya Jones, born Ekaterina Andreevna Sokolova ("Russian: Екатерина Андреевна Соколова"), is a Russian dancer and choreographer, best known as a professional dancer on the BBC One dance series "Strictly Come Dancing".
Giovanni Pernice (born 5 September 1990) is an Italian dancer and choreographer, best known as a professional dancer on the BBC One dance series "Strictly Come Dancing".
 Pernice is the Italian Open Latin Dance Champion (2012) and is the current Guinness World Record holder for Jive Kicks and Flicks.
Gorka Márquez (born 4 September 1990) is a Spanish dancer and choreographer, best known as a professional dancer on the BBC One dance series "Strictly Come Dancing".
 He has also appeared on live dance show, "Burn the Floor".
Strictly Come Dancing: It Takes Two, also known as Strictly: It Takes Two or simply It Takes Two, is a British television programme, the companion show to the popular BBC One programme "Strictly Come Dancing".
 It is broadcast on weeknights during the run of the main show on BBC Two at 6:30 pm.
 Claudia Winkleman originally presented the show, however she left in 2011 and now presents the main show.
 Since 2011, Zoë Ball has presented the show.
Trent Whiddon is an Australian dancer and choreographer, best known for his professional appearances on the BBC One dance series "Strictly Come Dancing".
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.
James "Jay" McGuiness (born 24 July 1990) is a British singer, songwriter and dancer, best known as a vocalist with boy band The Wanted.
 On 19 December 2015, partnered with Aliona Vilani, he won the 13th series of BBC's "Strictly Come Dancing".