Jessica Alba married the father of her unborn baby, Cash Warren [Images] on Monday, People magazine reported on its website.

The couple had a quiet wedding at the Beverly Hills courthouse's ceremony room, said Alba's representative, Brad Cafarelli.

The couple were casually dressed -- Alba wore a long blue dress and tied her hair back in a ponytail while Warren was in a white shirt and brown trousers.

People magazine, quoting a source, reported that the couple applied for a marriage license on Monday and waited about 40 minutes for the paperwork to be processed before a staff member from the courthouse married them.

According to the source, nobody else attended the wedding.

The couple, who met while filming for Fantastic Four, are expecting a daughter this summer.

Photograph: Getty Images