Screen siren Jessica Alba was forced to film scenes for new movie Into the Blue while high on drugs, because she suffers from terrible sea sickness.

The Sin City beauty was initially keen to star in the diving movie but was soon struck down by constant nausea.

And she admits the whole crew became spaced out on the medication.

She says, "I get terribly seasick.

"I took Tramevin every day - everybody did. We were all stoned."