Stevie Wonder and Aaron Kwok were among the stars who graced the annual Mnet Asian Music Awards on Friday in Hong Kong, the second consecutive year the K-Pop extravaganza was held in the city.

While Psy stole the show in 2012 with "Gangnam Style," this year's event will be remembered for its collaborations between K-Pop stars and other musical acts. Cantopop king Aaron Kwok and girl group Sistar's Hyolyn joined Stevie Wonder at the end of the awards show for a rendition of "I Just Called to Say I Love You,"...