After shaving her head bald in a Tarzana salon, Britney had a big day, first spending it poolside at the Mondrian hotel, and then clubbing into the wee hours.

She first shook her paparazzi tail by driving her car into the hidden Mondrian indoor garage. Then she hung by the pool in a blond wig, mismatched bikini and green hat, and chainsmoked while no one recognized her.

She then appeared at the Roxy nightclub sporting the same Marilyn-style blonde wig and huge sunglasses. 45 minutes later Brit stormed out in a huff when the DJ played "Hit Me Baby One More Time" in homage to the poptart. She went from the Roxy to the Polo Lounge.

One clubbing witness weighed in, "It was a shock to see her in a wig after what she had done to herself.

"While she was in the club she kept going to bathroom all the time, which was weird."

Brit's mom, Lynne, has flown from Louisiana to LA because she is worried about her daughter after the head shaving incident.

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Labels: Britney Spears