X FACTOR finalist Diana Vickers sailed through the first live show on Saturday.
Student Diana, 17, won rave reviews for her performance of U2's With Or Without You - sung barefoot on stage because she was worried about slipping over.
"You are the singing version of Marmite," said Simon. "You will either love it or hate it. And Diana, I loved it."
Louis added: "I think you are the one to beat in this competition."