Published Monday, 19 October 2009
The teenage star plays the central role in The Rise And Fall Of Little Voice, mimicking stars such as Dame Shirley Bassey, Edith Piaf and Marilyn Monroe.
The singer plays shy but talented Little Voice, known as LV, who comes out of her shell to brilliantly copy some of the world's most memorable singers.
And Vickers said that it was easier to play the role when she's "all vamped up".
She dons a revealing sparkly silver gown for the scene in which agent and wheeler-dealer Ray Say (Marc Warren) gets her a gig performing at the local nightclub, singing all her favourite songs.
Vickers, 18, said: "Obviously, it's quite hard playing a shy person when I'm not.
"It's quite hard to express yourself through facial expressions when I use my hands a lot, I talk a lot. But when I get up on that stage in my silver frock and I'm doing all these diva things it's just amazing.
"I'm not Vickers, I'm just all these different people."
The production of Jim Cartwright's play is being staged at London's Vaudeville Theatre, co-starring Warren and Lesley Sharp, who plays her mother.
Vickers - who revealed her former X Factor mentor Cheryl Cole is coming to watch her in the play - studied hard to learn the voices of the singing legends she imitates on stage.
"LV expresses herself through these people and I can totally understand why she would do that. It's just this great sense of freedom and it's great."
The closing song is written especially for the new run of the show by Take That's Mark Owen.
Vickers said: "When everyone told me that he was going to do it I had a small heart attack. He's so talented. I met him before and I was star struck."
"I was with him and I was just looking at him as he was singing it thinking 'Oh my God. You're a genius.' It's such an amazing song."