The show, in which Marco Pierre White gave the former 'Blue Peter' presenter her marching orders because she had shown "no growth", attracted a 28.9% share of the 9pm-10pm audience.
Pierre White said: "You're exactly the same as the day you arrived. There's no growth and that's why you're sacked."
Turner's departure leaves Adrian Edmonson, Niomi McLean-Daley, Danielle Bux and Linda Evans left to battle it out for the top prize, as viewers now take control of the voting process and decide who goes.
BBC One's 'Traffic Cops', which last night saw the South Wales traffic police attending a head-on smash on the M4 involving a party of youngsters, came second in the ratings battle with 4m viewers and a 28.1% share of the audience.
Five's US crime drama 'The Mentalist', which saw Patrick Jane investigating whether a young woman had stabbed her best friend to death in the woods, netted 2.4m viewers and a 16.9% share of the audience.
Channel 4 documentary 'Kimberley: Young Mum 10 Years On' caught up with a woman from a tough background who became pregnant at the age of 15. It scored 1.9m viewers and a 13.1% share of the audience, including Channel 4+1 figures.
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