The star was delighted when Darcey Bussell, Shirley Ballas and Bruno Tonioli all gave her the top mark.
But the joy was tinged with sadness as after a celebratory hug with her partner Gorka Marquez, Alexandra was seen crying and saying: “I just wish my mum was here.”
Alexandra’s mum, Melissa Bell, died just a day after the singer announced she would be taking part in the show, and Alexandra chose to hold on to her place in the line-up, stating it’s what she would have wanted.
The remark left a number of the ‘Strictly’ gang with tears in their eyes, including Oti Mabuse - who was dancing next with Jonnie Peacock - and a number of viewers got emotional too:
Alexandra’s brother and boyfriend were in the audience to offer support, cheering with the crowd as the star absolutely smashed it during the performance to Tina Turner’s ‘Proud Mary’.
Unsurprisingly, the jive put the pair at the top of the leaderboard, while down at the bottom, Charlotte Hawkins and Simon Rimmer are joint last.
Tonight’s (Sunday 15 October) results show will see another couple leave the competition.