Mom-to-be Jessica Alba and her longtime boyfriend Cash Warren became husband and wife on Monday, People.com reported citing a close source to the couple.

The couple, who met on the set of "Fantastic Four" in 2004, exchanged vows during a low-key ceremony in a Beverly Hills courthouse.

"She looked happy but nervous," the source said.

The pair kept so mum about the whole thing that even her brother, Josh Alba, was apparently caught off-guard. When reached by Us Weekly magazine with the news, he responded: "My sister!? I'm going to have to call her!"

Although Alba, 27, and Warren, 31, hit some rough patches in their relationship, and reportedly broke up last summer, Alba recently referred to Warren in an interview as her soul-mate. The two are expecting their first child together, a baby girl, in late spring/early summer.

Soon after announcing the pregnancy, Alba's publicist confirmed the "Good Luck Chuck" star has also gotten engaged after she was spotted spotted flashing an engagement ring during the Christmas holiday.

In an April interview, Alba admitted she didn't exactly plan her pregnancy but said she was "excited" for motherhood. "I think it's the best thing in the world that could have ever happened," she said. "I knew I wanted a baby before I was 31 and it just kind of happened."

Alba was previously engaged to her "Dark Angel" co-star Michael Weatherly, who is 12-years her senior but the two split in 2003..