It's a girl!

Kimberly Stewart gave birth to a baby girl Sunday in L.A. This is the first child for the 31-year-old actress, model and daughter of legendary rocker Rod Stewart. Oscar-winner Benicio del Toro's rep confirmed to Us Weekly Magazine in April that he was the father.

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"Benicio is the father and very supportive," the 44-year-old actor's rep revealed. "Although [he and Kimberly] are not a couple, they are looking forward to the arrival of the baby."

A source reveals that Rod Stewart, 66, and his current wife Penny Lancaster-Stewart were at the hospital during Kimberly's delivery. Alana Collins, who is Kimberly's mother and Rod's first wife, was also present.

The baby -- who has yet to be named -- was 22 inches long and weighed 8 lbs 9 oz.