Bread and butter work: the teen singer as Saturday girl sandwich maker

So after four albums in quick succession, the Welsh-born vocalist is taking time off from her career to simply hang out with her friends, keep up her studies and indulge a normal teenage curiosity in clothes, make-up and music.

And she has started to use her free time by promoting cancer research, helping out in a friend's sandwich bar in Cardiff and donating the Saturday-job earnings - about �30 - to a leading British charity.

Charlotte spent the day serving behind the counter at the city centre takeaway store, with many of the customers unaware their order was being taken by a multi-millionaire music artist.

The platinum album-selling teenager agreed to take part in the Cancer Research Campaign's Give A Day - and Give Them Years initiative in which celebrities donate their earnings from a job to highlight the issue of cancer research.

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She said her family had suffered from the disease, particularly on her grandfather's side, which prompted her to help the project started by Cardiff woman, Ginny Moon.

"It's an awful disease. I'd like to make people aware of how many families have been affected by it. Hopefully a cure will be found," she said.

As well as handing over her earnings for the shift filling bread rolls and baguettes, she pledged to make a separate donation to the charity's work.

But between customers she talked about how her career was shaping up after reports that she was trying out new images for her herself.

She said she was working with a range of musicians, music writers and directors to broaden her experience of the music scene to see if there were themes or styles which she wanted to explore.

"I haven't got a clue what direction I'm going to go in, I'm just doing different things with some interesting directors and musicians to see what happens.

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"I have a contract to do six albums and I can take until I'm 60 if I want, it's not a problem.

"I haven't got any "new image", I decide how I want to dress and do it.

"It's not me thinking "what image should I go for next." I'm living a bit."

"But I am lucky, I get a lot of designer clothes given to me through the record company - and all my friends nick them!"

She said her next engagement was performing at the closing ceremony at the Winter Olympics in Salt Lake City on 24th February.