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Britain's Catherine, Duchess of Cambridge, arrives at the Hope House charity in south London on February 19, 2013. British novelist Hilary Mantel faced criticism after describing Prince William's wife Catherine as a "shop window mannequin" with a "plastic smile" whose only purpose is to breed. ANDREW COWIE/AFP/Getty Images

Britain's Kate the Duchess of Cambridge waves at members of the media and people who gathered to see her, on arrival at Hope House, in London, Tuesday, Feb. 19, 2013. As patron of Action on Addiction, the Duchess was visiting Hope House, a safe, secure place for women to recover from substance dependence. (AP Photo/Matt Dunham)

Britain's Kate, The Duchess of Cambridge arrives at Hope House, in London, Tuesday, Feb. 19, 2013. As patron of Action on Addiction, the Duchess was visiting Hope House, a safe, secure place for women to recover from substance dependence. (AP Photo/Kirsty Wigglesworth)

Britain's Catherine, Duchess of Cambridge (L) speaks with members of staff as shge arrives at the Hope House charity in south London on February 19, 2013. The Duchess visited Hope House, an all-female rehabilitation centre which is is one of the projects run by her patronage, Action on Addiction. CARL COURT/AFP/Getty Images

Catherine, Duchess of Cambridge meets counsellor Lou Kramer (R) and Hope House resident Sabrina (L) as she visits the kitchens at Hope House residential centre, run by Action on Addiction for recovering addicts on February 19, 2013 in London, England. The Duchess, who is patron of the centre spent over an hour talking to residents at the centre, on her first public engagement since early January. (Photo by Mary Turner - WPA Pool/Getty Images)

Britain's Catherine, Duchess of Cambridge visits the art therapy group at Hope House charity in south London on February 19, 2013. The Duchess visited Hope House, an all-female rehabilitation centre which is is one of the projects run by her patronage, Action on Addiction. MARY TURNERMARY TURNER/AFP/Getty Images

Britain's Catherine, Duchess of Cambridge (C) speaks with the art therapy group during her official visit to Hope House residential treatment centre, run by Action on Addiction for recovering addicts, London February 19, 2013. REUTERS/Mary Turner/pool

Britain's Catherine, Duchess of Cambridge speaks with the art therapy group during her official visit to Hope House residential treatment centre, run by Action on Addiction for recovering addicts, London February 19, 2013. REUTERS/Mary Turner/pool

Catherine, Duchess of Cambridge talks with the trustee as she visits Hope House residential centre, run by Action on Addiction for recovering addicts on February 19, 2013 in London, England. The Duchess, who is patron of the centre spent over an hour talking to residents at the centre, on her first public engagement since early January. (Photo by Mary Turner - WPA Pool/Getty Images)

Britain's Catherine, Duchess of Cambridge pays an official visit to the Hope House residential treatment centre, run by Action on Addiction for recovering addicts, London February 19, 2013. REUTERS/Mary Turner/pool

Britain's Catherine, Duchess of Cambridge leaves Hope House addiction treatment centre after an official visit in London February 19, 2013. One of Britain's most celebrated authors has launched a withering attack on Britain's Duchess of Cambridge, Kate Middleton, branding her a "shop-window mannequin" with a plastic smile whose only role in life is to breed. REUTERS/Luke MacGregor

Britain's Kate, The Duchess of Cambridge receives flowers, as she leaves after a visit to Hope House, in London, Tuesday, Feb. 19, 2013. As patron of Action on Addiction, the Duchess was visiting Hope House, a safe, secure place for women to recover from substance dependence. (AP Photo/Matt Dunham)

Britain's Kate, The Duchess of Cambridge receives a bouquet of flowers, as she leaves after a visit to Hope House, in London, Tuesday, Feb. 19, 2013. As patron of Action on Addiction, the Duchess was visiting Hope House, a safe, secure place for women to recover from substance dependence. (AP Photo/Matt Dunham)