Josh Alba at the lLaunch party for Wes Borland's new Solo Album at the Vanguard Club. Hollywood, California - 31.05.07

Josh Alba was made aware of his actress sibling's marriage to longtime beau Cash Warren by America's Us Weekly magazine, and was stunned that the couple had not mentioned the secret wedding.

When told of the news by the publication, he couldn't believe the news: "My sister!? I'm going to have to call her!"

And when asked if he thought Warren was a good suitor for the actress, he added, "Well, he's my brother-in-law now!"

The couple was reportedly so desperate to keep the ceremony private, they didn't invite any guests - seemingly refraining to tell any close family members of their intentions to wed.

Alba and Warren announced their engagement in December (07), shortly after the Sin City star confirmed she was pregnant with her first child.

Source: WENN