R&B star Rihanna sympathizes with the high-publicized downfalls of troubled singers Britney Spears and Amy Winehouse - but refuses to suffer a similar fate. The Umbrella hit maker vows to never enter rehab because of an alcohol or drug problem, insisting she is too tough to collapse under the strains of fame.

She says, "I refuse to crack under pressure - in fact I thrive on it. So when I read about Britney and Amy Winehouse who have suffered under it, it's sad. It is easy to criticize them but it happens. You just have to stay focused and keep your feet on the ground."

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(This news article provided by World Entertainment News Network)