Los Angeles - As among the brightest and most successful young stars in the US music industry, Chris Brown and Rihanna were a match made in publicists' heaven. But just as they were set to send their relationship into hyperdrive with a joint appearance at the Grammy Awards on Sunday night, the fairy-tale romance turned sour and very ugly.
Brown, just 19, stands accused of making criminal threats against Rihanna, 20, and police say that prosecutors could charge him with more - or less - depending on their investigation.