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Kate Duchess of Cambridge talks to guests at a fund raising gala at the National Portrait Gallery in London, Tuesday, Feb. 11, 2014. . The Duchess is wearing a dress by British designer Jenny Packham and a necklace on loan from Queen Elizabeth II that was given to the Queen as a gift for her wedding in 1947.
LONDON—Duchess Kate returned to her public duties with a black tie fundraising dinner in aid of the National Portrait Gallery in London.

Officially known as the Duchess of Cambridge, the former Kate Middleton gave a short speech before guests including movie star Elizabeth Hurley and rocker Bryan Adams.

Kate wore a dark-colored, floor-length dress along with a diamond necklace loaned to her by her grandmother-in-law, Queen Elizabeth II.

Kate has been taking it easy on the social calendar since the birth of her son, Prince George, last year.