Her long brunette locks have become her signature look, but her thick hair is known to go frizzy in the heat
Prince William joked about his wife's hair being a "nightmare" today during a visit to Centrepoint.
The prince spoke with young people at his homeless charity and joked with one trainee hairdresser that she should try doing Kate's "nightmare" hair.
Kate's long brunette locks have become her signature look and she takes professional hairdresser Amanda Cook Tucker with her on every overseas visit.
Even when regularly groomed, her thick hair has been known to go frizzy in the heat, such as when she visited the Pacific Solomon Islands and Tuvalu with William in September 2012.
The Duchess usually wears her thick hair down and also has it regularly dyed at Richard Ward's salon in Chelsea.
William also spoke to one construction trainee at Centrepoint about his recent meeting with Jay Z in New York, and joined in a healthy breakfast session where young people were learning about nutritional food.
But it appears the Duke might have been more interested in the treats on offer as Centrepoint tweeted that William has a "sweet tooth" and included the hashtag #whoateallthechocolate.
The information was Tweeted by Centrepoint as the media was not invited to the event.
A palace spokeswoman said: "The Duke paid an unofficial visit to Centrepoint this morning in order to meet some of the young people and show support for the charity at what is a key time of year for them."
As patron of Centrepoint, William takes a keen interest in its work and since taking up the post in 2005 has toured a number of its facilities and centres.
Seyi Obakin, Centrepoint's chief executive, said: "The Duke of Cambridge's visit provided a huge boost for all the young people he met ahead of Christmas, which for them can be a difficult and emotional time.
"Fortunately for many vulnerable young people staying with us in London, Sunderland and Bradford, while they won't have their families around them, they will have Centrepoint.
"We estimate that 15,000 young people will face homelessness alone this Christmas.
"Whether they're exposed to the elements or moving from one floor or sofa to another, the futures of these young people are at risk.
"Homeless young people are twice as likely to die as their peers.
"We must ensure that, wherever they are, young people have the vital support they need to leave homelessness behind."
William also spoke to one construction trainee at Centrepoint about his recent meeting with Jay Z in New York.
The information was tweeted by Centrepoint as the media was not invited to the event in Soho, central London.
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