Rhianna suffered silently

"It feels like my head is in some kind of vice."

R&B star Rihanna suffered from such excruciatingly painful headaches when she was growing up, doctors worried she was suffering from a brain tumor. The 19-year-old singer underwent a number of CAT scans from the age of eight until she was 14, when her parents divorced.

It turned out the cause of Rihanna's headaches was the stress of her parents' stormy relationship - her dad Ronald Fenty had an addiction to crack cocaine, which he has now conquered.

She says, "I wouldn't cry. I wouldn't get upset. It was just all in here (her head). I had to go through a lot of CAT scans. They even thought it was a tumor, because it was that intense. It's not great memories. But it helped me score some seriously killer pain pills - let's just say I was popular in school."