Kimberly Stewart and Benicio del Toro, who are not a couple, are expecting a child together, a source told People.com.
The source said del Toro "is supportive and both [he and Stewart] are very excited" about the baby.
Stewart is the daughter of musician Rod Stewart.
Del Toro's film credits include "The Usual Suspects," "Basquiat," "The Funeral," "Excess Baggage," "Traffic," "21 Grams," "Che" and "The Wolfman."
People.com said representatives for del Toro and Stewart did not respond to its requests for comment on the story.