Her career started in 1971, when of New World Pictures launched.
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Maggie has two older half-siblings from her mother's previous marriage, and two older sisters.
The family settled in nearby Murrysville, when Julie was two, and she started ice skating at age three.
When she was 17 she joined a girl group and soon after was signed as a solo.
She grew up in the Chicago area, until the family relocated to Oceanside.