The Strictly ShowdancersAneta Piotrowska Crystal
Main Darren Bennett Ian
Aneta's career began at the age of 10 in Poland, and five years later she moved to London to dance as an amateur with Derek Hough (who's currently one of the pro dancers for Dancing With The Stars in America).
She has performed in the Polish version of Strictly, where she won the third series of the show with partner Rafal Mroczek, a soap actor.
Aneta's Strictly Showdance partner is Ian Waite.Watch: Exclusive interview with Aneta
As a junior, Crystal was ranked fifth at the World Open British Youth Ballroom Championships and went on to become UK Ballroom, Latin and Ten Dance Champion.
She was an original member of the UK touring cast for Simply Ballroom and joined Darren Bennett and Lilia Kopylova's Latin Fever stage show in 2009. She has also performed on South Africa's version of Strictly Come Dancing.
Crystal's Strictly Showdance partner is Darren Bennett.Watch: Exclusive interview with Crystal
Strictly star Darren first joined the show back in 2004, alongside his wife and professional partner Lilia Kopylova.
The couple first got together in 1997 and went on to win the British National Latin Championships four times. They turned professional in 2003, won the British National professional Championship two years in a row and reached the final of the World and European Championships.
Darren won the Strictly glitterball with partner Jill Halfpenny the first year he appeared in the series. He has since gone on to create and choreograph stage show Latin Fever with Lilia.
Darren's Strictly Showdance partner is Crystal Main.Watch: Exclusive interview with Darren
Ian first started his dance career at the age of 10 and went on to become European Youth Latin American Champion.
He then teamed up with partner Melanie Walker and the couple competed all over the world in a relationship that lasted 10 years. In that time they represented England in many European and World dance championships.
He joined Strictly in 2004, reaching the final with partner Denise Lewis that year and finishing third in 2005 with Zoe Ball.
Ian's Strictly Showdance partner is Aneta Piotrowska.Watch: Exclusive interview with Ian
Shem has competed at the World Championships in Ballroom, as well as the Four Continents Championships.
He featured as a pro dancer in the Polish version of Strictly. He's also appeared as a dancer for various TV performances with Kylie Minogue, Alexandra Burke, Miley Cyrus and Duffy.
Shem's Strictly Showdance partner is Tanya Perera.Watch: Exclusive interview with Shem
Tanya has 19 years of competitive Dancesport experience, having previously been crowned an Amateur Open Ten Dance Champion. In 2004 she was a runner-up in Strictly Dancing in Australia.
Her West End debut came with a role as a featured dancer in the original cast of Dirty Dancing. She joined the stage production of Latin Fever in 2009, which was created and choreographed by Strictly stars Darren Bennett and Lilia Kopylova.
Tanya's Strictly Showdance partner is Shem Jacobs.Watch: Exclusive interview with Tanya