The girl behind Beyonce's smash hit reveals the secret of her success

PREGNANT songwriter Amanda Ghost is the real voice behind Beyonce and Shakira's smash hit Beautiful Liar - after penning the song in the back of a taxi.

British-born Amanda, 32, penned the No.1 single after meeting Beyonce's boyfriend, record mogul and artist Jay Z.

But Beyonce gave her just 24 hours to finish the song and she ended up jotting down the lyrics in the back of a New York cab as she headed to the recording studio to meet the ex-Destiny's Child singer.

As she celebrated getting to No.1 this week, Amanda - who also wrote James Blunt's You're Beautiful, said: "I met Jay Z a year ago and he liked my work. He said 'My girlfriend needs a song. Would you meet her?' and I said yes.

"We met in New York and I had a day to write it because she was going to record it the next day, so I had to write it in a cab in New York.

"The thing about songs is they go round in your head so it doesn't matter where you are. I wrote it partly in the taxi, partly in the hotel and partly in the shower. I wrote it down in the cab and she loved it, which was very lucky."

Amanda is in demand because she manages to put feelings and emotions into words.

She explained: "It is a lot of fun because you don't have to focus on your own problems and demons. You can just let it out. You try and put yourself in the position of the person who is singing.

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