People Staff
December 27, 2007 AT 06:00 PM EST

After actress of Mexican descent Jessica Alba was seen wearing a diamond on her wedding ring finger over Christmas, her rep told that she and Cash Warren are engaged.

“I can confirm that they are engaged,” says publicist Brad Cafarelli.

Alba, 26, and Warren, 28, announced earlier this month that they’re expecting their first child. The two have been involved romantically since the fall of 2004, when they met on the set of The Fantastic Four. Alba starred in the movie, and Warren was a director’s assistant.

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