Britney: Yes, I'm Sick -- But in a Good Way!

Miss Britney Jean Spears, when told to wear a coat against getting sick ... said "I'm already very sick, but in a good way." Oh, lordy.

TMZ caught Spears making two late-night trips to Rite-Aid, where she also attempted metaphysical philosophy by saying Heath Ledger is "... still here, no one ever really dies."

Later, British Brit worked out at 24 Hour Fitness for more than two hours ... BTW, she started working out at 1:30 AM and stayed for more than two hours. Welcome to her world.
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