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 fiancé Cash Warren.

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

Blooming: the actress made a glamorous appearance at Sunday night's Oscars

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.

She wrote: "I did have a stumble backstage... Cash caught [me]. Luckily all the photographers were taking pictures of Cameron [Diaz] looking gorgeous in pink."

She also revealed she passed over VIP parties in favourt of a quiet night with her fiance.

"Instead of hitting up the Governor's Ball or any other party, we opted for sweats and In-N-Out Burgers," she noted.

"Being preggers kind of takes the fun out of partying until the wee hours. Sleep always sounds so much better these days."

Jessica, who announced her pregnancy in December and got engaged weeks later, is also adjusting to her changing shape.

She has said: "When you're pregnant, your breasts are engorged and your stomach is getting bigger by the second."

"But it's awesome. It's the best time ever."