Birthday girl Jessica Alba, celebrating her 30th birthday, treated herself with a visit to a Los Angeles spa yesterday.

The pregnant star wore a flowing white dress and platform high heels while carrying a ThinkSport reusable water bottle.

Alba insists on keeping fit as she prepares for the birth of her second child because she's convinced a healthy body will produce a healthy baby.

She told Latina magazine, "I'd like to still do something five days a week, from a half hour to an hour - nothing excessive, just some moving (around). It makes the whole pregnancy so much easier. The more fit you are, the easier the birth is, and a healthier baby you're going to have."

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