Leona Lewis can barely contain her blushes as chatshow host Letterman tries to take her home

It's rare for American chatshow host David Letterman to do more than shake the hands of performers on his U.S. show.

But when X factor winner Leona Lewis made an appearance he could hardly keep his hands off her.

The 23-year-old stunned Letterman, and the audience, with a moving performance of her song I Will Be.

Smitten: A blushing Leona Lewis looks uncomfortable as David Letterman invites her back to his following her performance on his chatshow

Hugging Leona a smitten Letterman caught her by surprise by asking: 'Anything you want to talk about?'

As Leona looked bemused Letterman cheekily added: 'Let's go up to the house and we'll talk about it.'

Following her performance Letterman said: 'Beautiful! Oh my God that was lovely.'

Praise: Letterman described Leona's performance as 'beautiful and lovely'

But rather than looking pleased with his attentions a blushing Leona looked distinctly uncomfortable.

Earlier this week's Letterman's attentions were on Jennifer Aniston, who appeared on the show in a thigh-high mini dress.

He could hardly tear his eyes away from her legs as they chatted about her latest movie, Marley and Me.

Singing beauty: Leona performed her song I Will Be on the show

Leona's performance was just the latest step towards her domination of the American music scene.

Last month she continued her remarkable success as she picked up two prizes at the World Music Awards.

The young star was named Best Pop Female at the event, which honours the best selling acts of the year.