Moby provides the lead vocals, with additional haunting backing vocals from Pilar Basso.
There are actually for "Porcelain":
Moby has stated that "Porcelain" is deeply personal, reflecting on the end of a relationship with a "wonderful woman" he loved. It explores the painful realization that despite that love, the two people have "no business being romantically involved". Music Videos
The track gained massive popularity after being featured in the soundtrack for the Leonardo DiCaprio film The Beach . Moby – Porcelain Lyrics - Genius