Jessica Alba has posed in a Hannibal Lecter mask in a bid to encourage people to vote in the U.S. Presidential election.

The "Fantastic Four" actress is seen with messy hair, no make-up and tears running down her face in the photograph shot by Mark Liddell which shows her mouth tightly hidden behind metal nails - referencing the cannibal character made famous by Anthony Hopkins in 1991 movie 'The Silence of the Lambs'.

Jessica's photograph, a "Declare Yourself" public service announcement (PSA), bears the tagline: "Only you can silence yourself. Make them hear you. Register to vote now."

Jessica, who previously appeared in a raunchy bondage-themed advertising campaign for Declare Yourself, recently said: "If you don't register and vote and make a difference, and hopefully change the bad things that are happening in our country, you are essentially just binding and muzzling yourself."

The 27-year-old actress isn't the only star to use her celebrity to persuade Americans to vote.

Leonardo DiCaprio, Halle Berry, Jennifer Aniston and Ellen DeGeneres are among those appearing in the "5 Friends" PSA.

Explaining his involvement in the cause, Leonardo said: "I mean, seriously, after this whole video - if you're not going to vote, I don't even know what to say. You know you have to vote."

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