Jessica Alba put her baby bump on show during a shopping trip in LA yesterday, trading in her glamorous Oscars look for street chic.

The Fantastic Four actress, who is rumoured to be expecting twins, kept it casual with a full length black summer dress and flip flops as she hit the stores with her fianc Cash Warren.

Baby on board: Pregnant Jessica Alba kept it casual while shopping in LA yesterday

Jessica, who recently revealed she is in her "third trimester", opted for a relaxed approach to fashion after making a dazzling appearance at the Academy Awards earlier this week in a strapless Markesa dress with Cartier jewellery.

She presented a gong at the ceremony, and noted on her MySpace blog she was relieved to have made it through without tripping over her dress on stage.

But she did lose her balance away from prying cameras.