Canto-pop star and movie actress Karen Mok Man-wai came to the Operation Santa Claus launch at Government House along with her mother, who said her daughter takes any charity commitment very seriously.
Mok has decided to become an ambassador for Enlighten Hong Kong to increase awareness about epilepsy.
Mok's decision closely follows former chief secretary Anson Chan Fang On-sang's acceptance of a role as honorary patron of the organisation.
'To say we're excited is an understatement,' said Enlighten Hong Kong's executive director Orla Gilroy.
'Epilepsy is an illness that doesn't get a lot of coverage, or if it does it is often negative. Karen Mok and Anson Chan are recognised and loved by Hong Kong people but are very international ladies. It's great that they've offered to do this.'