The actress, best known for her role as Ginny Weasley in the Harry Potter films, looked sophisticated in a long white dress teamed with a camel boyfriend-blazer as she arrived at the event with her mother, Wright & Teague jewellery designer, Sheila Teague.
SEE PICS OF CELEBRITIES WITH THEIR MUMS
The funds raised by the auction will be used by Women for Women International to provide female survivors of war and conflict with the resources and tools they need to move on from crisis and cope with poverty.
The auction will be open to the public from 13 to 16 October. For more information, go to womenforwomen.org.uk