Dell'Olio and Anton du Beke finished at the bottom of the leaderboard again last night after their Halloween rumba was blasted by the judges.
Dixon was the strongest critic on the panel, claiming that it would have been better if she had remained in the stage prop coffin for the whole routine.
"I think you're a sexy woman and you know how to work it but I have to be honest, you are a walking disaster," said the popstar and former Strictly champion.
"Your legs are so far apart and that's not very feminine. No, I'm being serious, and it was very ploddy.
"And the lift, Anton the lift was so unflattering. The lift was so unflattering, you both should have stayed in the coffin."
Craig Revel Horwood billed it a "dance horribilis" and Bruno Tonioli called Dell'Olio a "zombie of Bond Street".
Head judge Len Goodman joked: "There were moments of Mills and Boon and moments of Meals on Wheels."
The Strictly results show airs tonight at 6.25pm on ITV1.
> 'Strictly Come Dancing' ratings overtake 'The X Factor'
> 'Strictly Come Dancing' Halloween special - In Pictures