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“I don’t know if I could be as dedicated as she was. “Having to stand up for hours in her condition and sing? I never would have guessed how normal she is.”
Keri goes on to say that Britney would use her time in the studio as an “escape” from the intense media scrutiny she was put under at the time:
“She was catching so much hell from all corners, but she left it all outside the studio and came in ready to work.”
Source: Rated Magazine