The pop star/actress asked pals to come with her and make sure she stuck to her teetotal tester.
She explains, "I didn't drink for, like, three months. My friends and I were like, 'OK, we're out of L.A., away from everything. Let's cleanse ourselves from boys and Sidekicks [personal organizers] and email.'
"We worked out all the time and drank so much green tea. I'm definitely a lightweight now."
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