R&B supercouple Chris Brown and Rihanna suddenly found their relationship thrust into the headlines when Brown was arrested on suspicion of attacking a woman widely reported to be Rihanna.

While various celebrity websites, citing sources near both Brown and Rihanna, reported details of an argument in Brown’s car in the wee hours of Sunday morning, the fact is that right now, nobody really knows exactly what happened except those two, and neither is talking to anyone but the police.

And the police have been equally quiet.

Brown and Rihanna scrupulously avoided discussing their relationship in the past, which makes what went wrong even more of a mystery.

Last fall, shortly before a show in Australia, Rihanna was interviewed by Melbourne radio station Fox 101.9 and talked about Brown, but would not confirm they were anything more than friends.

"We are very good friends, we are cool, we are best friends, we hang out all the time, and now we’re doing a tour together," she told the station.

When asked about why she did not want to talk more about the relationship, the Barbados-born pop diva said that she had her reasons to be close-lipped.

"I speak my mind and I don’t really have any regrets, even if I said something now and things change, things always change you know in life. People change," she said.

Brown also did not speak much about his relationship with Rihanna.

But in 2007, he told Giant Magazine that his stepfather used to hit his mother.

"He made me terrified all the time, terrified like I had to pee on myself. I remember one night he made her nose bleed. I was crying and thinking, ‘I’m just gonna go crazy on him one day ...’ I hate him to this day," he told the magazine.

For a couple who tried to keep their relationship quiet, the latest incident is sure to be a personal nightmare.

- Reuters