Jessica Alba Engaged!

By Julie Jordan

Thursday December 27, 2007 03:45 PM EST

Jessica Alba and Cash Warren

Jean Catuffe/INF

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Mom-to-be Jessica Alba was spotted over the Christmas holiday with a rock on her left ring finger – and the rumors are true: She and boyfriend Cash Warren are engaged, her rep confirms to PEOPLE.

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

Earlier this month, the couple announced to PEOPLE that they are expecting a baby. Alba, 26, has been dating Warren, 28, since the fall of 2004, after they met on the set of her movie, The Fantastic Four, on which Warren was a director's assistant.

Alba has also starred in Sin City and the recent Awake.

Jessica Alba, wearing a ring as she leaves the gym on Dec. 26 Photo by: WENN