Jessica Alba's brother has hinted the newlywed actress is planning a second wedding ceremony later this year to celebrate her nuptials with family and friends.

The pregnant star wed her longtime beau Cash Warren in a low-key ceremony at Beverly Hills Courthouse on Monday - just 40 minutes after applying for a marriage licence.

The couple were reportedly so desperate to keep the nuptials private, they didn't invite any guests - even their immediate family.

Alba's brother Josh was only alerted to the news by America's Us Weekly magazine, and he couldn't believe it.

He exclaimed: "My sister!? I'm going to have to call her!"

Even the Fantastic Four star's father, Mark Alba, was unaware of the quick ceremony - but he insists he is happy for his newlywed daughter.

He tells Latina magazine, "I think it's good news for her. I'm glad for her. She's a beautiful girl. I'm her dad and I'm happy for her no matter what happens."

However, Josh later explained to E! News that he was only surprised at the secret wedding because he knows "they are going to do a big ceremony later".

He added, "I just don't know any of the details yet."

The couple announced their engagement in December, shortly after Alba revealed she was pregnant.