In 2007, Leong was made an ambassador for the Motorola Singapore (RED) Campaign, an initiative spearheaded by Bono of U2 to alleviate the spread of HIV in Africa.
In September 2008, Leong was invited to cameo in an episode in Calefare, a knock-off of the popular HBO series, Extras, acting as a popular singer named Johnny Chia, a parody of himself.