Introducing Saara Aalto, the 64-year-old mentor became muddled when she forgot the name of the song from the film Titanic that her act was performing.
The Celine Dion classic My Heart Will Go On was a struggle to remember for the judge, who in previous weeks forgot the name of her acts.
Viewers took to Twitter to accuse the TV personality of shouting "f**k it" during the pre-watershed family show and accused the programme of becoming a “shambles”.
One audience member tweeted: "Pretty sure Sharon Osbourne just said 'oh f**k it!' She's the best bit about X Factor. It's a shambles anyway. #XFactor."