Kate Middleton on April 20, 2011
Glossy magazines hoping to carry exclusive portraits and an interview with Kate, The Duchess of Cambridge
can forget it, for now.
Latest rumors were that Vogue
was hoping to secure a shoot by Mario Testino for the fashion monthly. But the palace denies any deal. "There are no plans for the Duchess to do anything with U.S. Vogue
," a spokeswoman tells PEOPLE.
In any case, Kate, 29, has her mind on other matters. A few days after she attended the wedding of a friend
, she is set to open a children's cancer center
Thursday with Prince William.
While it is part of William's continuing royal work, the event will provide Kate a chance to experience an official royal event at a hospital, the Royal Marsden. The hospital was one of the causes favored by Princess Diana, and the prince took over in 2007.
Kate is also doing her own search over the coming months to seek out the kinds of causes where she believes she can "make a difference," a palace source tells PEOPLE. She is consulting friends, family and aides, and quietly visiting charities as she learns more about the voluntary sector and how the royal family interacts with the British public.
"She knows her role is to bring a spotlight onto causes and she will do that – and when she starts, she will do it with gusto," the palace source adds.