Katie turned super-sexy for her version of Kylie's Can't Get You Out Of My Head, but it wasn't enough to save her for a sixth time.
David sang Don't Let The Sun Go Down On Me, and got great reaction from the Academy tutors, the crowd watching and the phone vote.
Ainslie unleashed another typically unusual performance, giving Don't Get Me Wrong by The Pretenders a fantastic update.
Who's on the probation next week?
For the first time there was also a live vote in the Shepperton studio from the audience, who thought David was the best of the three - but only by 1%.
Like last week, the teachers revealed the first person singing for survival in seven days, and next week it will be Malachi.