Prince William once dumped Kate Middleton over the phone in the years before they were married a bombshell new book has claimed.

Royal biographer, Robert Lacey, has claimed to have heard of the moment a 25-year-old Kate was savagely dumped by her future husband while in the middle of a day at work of a high street brand.

While Prince William and Catherine, Duchess of Cambridge, have been happily married since 2011 – and are proud parents to Princes George, Seven, and Louis, two, and five-year-old Princess Charlotte – they had a rocky patch during their 19-year romance.

According to Mr Lacey, the royal couple – who met in 2001 while both students at the University of St Andrews in Scotland – broke up on 11 April 2007.

He claims in his new book, Battle of the Brothers – as serialised in the Daily Mail – that Kate was dumped over the phone when she was at work for high street fashion chain Jigsaw.

Prince William and Kate Middleton broke up in 2007 before marrying in 2011

Mr Lacey writes: "Kate excused herself from a meeting at Jigsaw, the fashion store with which she'd recently started working, to take a call from William in a room out of earshot of the other buyers.

"She shut the door for more than an hour. When she came out, she was single."

The royal couple met at University in St Andrews

Fortunately, the break-up was only to last for a few months before the young couple fell for each other again – eventually marrying in 2011.

Prince William, now 38, has previously addressed the brief break-up during an interview following their engagement in 2010.

He said at the time: "We were sort of both finding ourselves as such and being different characters and stuff, it was very much trying to find our own way and we were growing up."

Kate, William and Michael
Prince William and Kate became husband and wife in April 2011

Meanwhile, the Duchess herself previously said it was difficult not to be "consumed" by the relationship when they first began dating.

Discussing the split previously, the 38-year-old said: "At the time, I wasn't very happy about it but actually it made me a stronger person.

"You find out things about yourself that maybe you hadn't realised, or I think you can get quite consumed by a relationship when you are younger and I really valued that time for me as well although I didn't think it at the time. Looking back on it."