Benicio del Toro, Kimberly Stewart Welcome Baby

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The Oscar winner and Rod Stewart's daughter are "are not a couple, [but] they are looking forward" to co-parenting.

Oscar winner Benicio del Toro and Kimberly Stewart welcomed their first baby, a girl, in L.A. on Sunday.

The baby weighed 8 lbs, 9 oz. and has yet to be named, Us Weekly reports.

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Kimberly's father, legendary rocker Rod Stewart, and his wife, Penny Lancaster-Stewart, were present for the birth. Alana Collins Stewart, Kimberly's mother and Rod's first wife, was also there.

A rep for the actor said in April: "Benicio is the father and very supportive. Although they are not a couple, they are looking forward to the arrival of the baby."

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Del Toro won a best supporting actor Oscar for 2000's Traffic. He's currently filming Savages, directed by Oliver Stone and co-starring Blake Lively and John Travolta.

Stewart starred in 2007 U.K. reality show Living With ... Kimberly Stewart.