The palace reveals that they have already started receiving bids for Kate to join charities as a patron and help put them on the map.
But the organizations are going to have to wait.
It will take "months or even years," for her to gradually build up her set of patronages, says a palace source. Prince William has similarly added a number of charities – from those that deal with homelessness to others that support injured servicemen and women – to his roster over the years.
"Inevitably we have had approaches, but we are not making decisions before the wedding," says a palace spokesman. "Catherine wants time, once she is a member of the Royal Family, to come to a decision about what she wants to do. She wants to decide what her own interests are and develop those over time."
It is likely that Kate, who turned 29 on Sunday, will join William, 28, at some public engagements before her April 29 wedding in order to continue to learn the ropes from the inside, alongside her fiancé. This will enable her to see what expected of her in her public role, and also gauge what causes she wants to get behind.
"Her thinking is that she wants to commit," adds the source. "She wants to do something that she is genuinely passionate about."