By Olivia Wheeler Amy Dowden left viewers in tears on Saturday night as she made a surprise appearance during the Strictly Come Dancing final on Saturday. The professional dancer, 33, who has been a pro on the hit BBC One series since 2017, was diagnosed with stage three breast cancer earlier this year. Amy was unable to have a celebrity partner on Strictly this year following her diagnosis and subsequent cancer treatment. However, despite not being partnered with a celebrity on the show this year, Amy has still been involved in the series as she has regularly been seen on the balcony, support…