The 27-year-old actress, who is pregnant with Warren's child, exchanged vows at the Beverly Hills Courthouse Monday, her publicist Brad Cafarelli confirmed to People, but giving no further details.

Alba and Warren, 31, met on the set of the "Fantastic Four" in 2004. The couple announced their engagement shortly after Abla confirmed her pregnancy in December last year.

Her wedding was such a quiet affair that even her brother, Josh Alba, was apparently kept from it.

When reached by Us Weekly magazine with the news, he responded: "My sister!? I'm going to have to call her!"

When asked if Warren suited his sister, Alba said: "Well, he's my brother-in-law now!"

The sex symbol shot to fame as an action star on TV's "Dark Angel," then in films including "Fantastic Four" and "Sin City."

Alba charts high in men's magazines' lists of the "sexiest" women in the world. She was No. 1 to FHM readers last year, and dropped to No. 3 this year.