She had to sing for survival against Quigg but the judging panel chose to keep him in the competition.
Both burst into tears at the verdict and, as Diana sang her farewell song, inconsolable Quigg, 16, rushed on to the stage to hug her.
The former turned out to be true as Vickers made it through eight rounds of live shows without ever falling into the bottom group; in one week she was given a bye from the competition because of her acute laryngitis.
Oddsmakers had Vickers pegged as the winner of the whole competition, but it wasn't meant to be.
Trivia: JLS is also the brand name of a Chinese gas bolt action sniper rifle. On the final: "I'm not nervous for the final, singing-wise, but the results are always going to be nervous.
Tabloid "scandal": Louis Walsh has ordered JLS to hit on the female competitors to put them off.
According to Simon Cowell, 500,000 pre-orders have already been placed for the single. Which successful act is she most like: Whitney Houston. [Watch on the X Factor website] Judge's pearl of wisdom: "This is a British competition and you make me very proud to be British. Superstar advice: "I think Alexandra can belt her voice too much. She really needs to have lots of lessons and make sure she doesn't lose that voice" - Will Young. Trivia: Alexandra nearly made it through to the competitive stages of X Factor in 2005, but Louis Walsh turned her down, saying she was too young.