'This song is not cool enough': Singing sensation Charli XCX reveals Hilary Duff's agents rejected her Number One track Boom Clap which launched her career

It's the track that propelled Brit sensation Charli XCX to stardom but Hilary Duff's people rejected Boom Clap outright with just six simple words: 'This song is not cool enough.'

Gravel-voiced Charli revealed she offered the American Disney channel star the song she penned a year and half ago but it failed to strike a chord with her people.

The 22-year-old raven-haired star, born Charlotte Aitchison, told Thursday's Kyle and Jackie O show: 'I was drunk one day and I thought "Let's give it to Hilary Duff, I'm, a fan."

'Not cool': Charli XCX, at Wednesdsay's ARIA awards, revealed she offered American star Hilary Duff Doom Clap but it failed to strike a chord with her idol's people

International star: Hilary Duff, pictured in New York last month, later tweeted that she would have snapped up the track had she known

'I heard she was recording a new album and thought she probably might like it.'

Asked by 2DayFM host Kyle, 43, why the Disney channel star's people didn't want it, Charli shrugged saying: 'Er, quote: "This song isn't cool enough."'

Leaning forward in disbelief, a stunned Kyle added: 'That's ridiculous, why didn't they take it? That song launched your signing career, didn't it?'

Lady in black! Charli, 22, who performed at the American Music Awards on Monday, she said she still finds it daunting singing in front of crowds, despite a meteoric rise in the music indusrty

The Cambridge-born beauty nodded furiously in agreement, adding: 'Thank God she didn't otherwise I wouldn't have a career.'

She went on: 'Actually, when she [Hilary] heard about it, she tweeted and said: 'Oh my God, if I had known I would have taken it. She seems really nice.'

Charli would to sing at raves when she was in her mid-teens crooning outlandish songs about dinosaurs having sex.

But most music followers first learned about her around 2011 or 2012 when she was in her 20s.

Femme fatale! The raven-haired singer showed off her curves in a black down as she wafted along the red carpet at the AMAs

She then saw a meteoric rise in 2014 with her acclaimed features on Swedish duo Icona Pop and Iggy Azaela’s hit singles, as well as her own radio knockout, Boom Clap.

In 2013 she released her debut album True Romance, a strong but underrated effort that didn't quite captivate the audience she expected.

The singer recently opened up about how feeling like an outcast at school stifled her effervescent personality and that she has only come into her own in the last few years.

Breaking the rules! The Brit talent rocked a rubber ensemble as she stormed the stage to perform three of her tracks at the awards ceremony in LA 

She told the London Evening Standard: 'I was never the cool kid in school, and loads of people told me that I was weird, that I dressed uncool and did uncool things, that I was too nice, too happy.

'All of that made me want to compensate for my personality by making quite a muted and shy album, really.

'Now I really don’t care what people think - I've made this [new] album because it’s what comes naturally to me. I feel less afraid to say that now.'