S01E16: Series 1 - Live Show 5

Cassie and Tabby were the final two people left and the judges had to choose between them. Louis and Simon both voted Cassie off. Sharon refused to give a vote. Kate Thornton said that if the votes were tied, then the person who would be kicked out is the person who got the lowest phone votes. Over 2 million people had voted for Cassie and Tabby.