Dancing to Amy Winehouse’s Back To Black, the couple scored a total of 38 out of 40 and received very high praise from the judges.
Anton Du Beke said: “There’s been some great dances tonight. this has been my favourite.”
Shirley Ballas added: “If there was ever a place to bring your ultimate performance, you brought it today.”
Speaking to presenter Claudia Winkleman, a tearful Gu said: “I am so proud. I am so happy the judges gave the comments to her like that. She’s been down actually for quite a few weeks. Hearing that, I am just really happy.”