Emma Watson looked like she was ready to return to Hogwarts as she attended an exclusive charity dinner to celebrate.

The work of The Royal Marsden sponsored by fashion designer Ralph Lauren at Windsor Castle.

The actress was one of the many A-list stars invited to the bash which was hosted by Prince William on Tuesday night.

Emma, 24, sported a somewhat preppy look as she teamed a crisp white shirt with a long grey skirt.

The Harry Potter star looked chic in her ensemble as she kept accessories to a minimum as she held onto a small silver clutch and wore a plain silver necklace.

It’s safe to assume her preppy outfit was in homage to the evening’s sponsor, Ralgh Lauren, who’s fashion house is famous for that distinctive style.

Emma highlighted her natural beauty with a sultry smokey eye and blood red lipstick while she styled her brunette locks into a slightly old-fashioned updo.

The actress joined the likes of Kate Moss, Cara Delevingne and Cate Blanchett at the event which was organised to raise awareness for the cancer charity which also happened to be one of Princess Diana’s favourites.

Emma and other guest were treated to a three-course dinner in Windsor’s famous medieval halls and Georgian salons before they were serenaded by singer Emeli Sande at the end of the evening.

Prince William became president of the Royal Marsden Hospital in 2007 and threw the soirée because he is keen to enhance his philanthropic profile.

The Duke, who is said to have personally asked the Queen for permission to host the gala dinner, gave a brief welcome and address in which he thanked Mr Lauren for extending his philanthropic work to the Marsden.

Ralph Lauren’s company is the ‘Official Outfitter’ for the Wimbledon tennis championships and his personal association with William and the Marsden will see him take a further step into the upper reaches of British society.

Emma is currently about to begin work on her upcoming film, Regression, which is due for release in 2015.

The film which also Stars Ethan Hawke, follows a father accused of a crime he has no memory of committing.

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