Undercover bump!

The day before Jessica Alba went public with her pregnancy news -- she used her Twitter and Facebook accounts Wednesday to reveal she and hubby Cash Warren are expecting their second child

the Little Fockers star, 29, camouflaged her teeny belly while running errands with two-year-old daughter Honor in West Hollywood.

The actress, whom a source reveals to UsMagazine.com is three months along, hid her baby bump under a loose shirt and giant handbag while making a trip to a local hardware store with her tot Tuesday.


She made a similar sartorial choice at last week's Help Haiti event, where she donned a flowing floral dress.

Alba opened up to Us last fall about her little gal's own fashion sense.

"She likes to wear her angel wings in the house," she said, adding that her dad struggles to put together her outfits. "I would say it sometimes stresses him out to get her dressed," she admitted of Warren.