May 06, 2011 09:00 AM

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Mom-to-be Kimberly Stewart shows off her burgeoning belly bump while making her way through a Brentwood, Calif. parking lot on Wednesday.

The actress/model, 31, is expecting her first child with actor Benicio del Toro.

Although the parents-to-be are “not a couple,” the pair are “looking forward to the arrival of the baby.”

RELATED: BumpWatch: Kimberly Stewart Shows Off Her Belly

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