Amy Poehler

Amy Poehler

Celebrities including Jada Pinkett Smith, Amy Poehler and Leona Lewis have got behind an online campaign demanding the release of the kidnapped Nigerian schoolgirls.

Shout! Participate! Show that you care! British singer Lewis posted a similar snap, while TV presentermodel Alexa Chung wrote her message in red lipstick on a mirror and posted the picture online

The teenagers were snatched from a school in northern Nigeria last month (Apr14) during a night raid by members of the Boko Haram extremist group, who want to deny the girls a Western education.

A campaign has been launched via Twitter.com, BringBackOurGirls, and now several stars are supporting the protest, which demands the girls' release, and pressures the Nigerian government to take action.

Pinkett Smith urged fans to sign a petition calling for global help with the situation.

Other stars to back the drive include actresses Alyssa Milano, Queen Latifah and Minnie Driver.

Comedienne Poehler posted a picture of herself holding a piece of paper with the 'hashtag' written on it, and told followers, "Shout! Participate! Show that you care!" British singer Lewis posted a similar snap, while TV presentermodel Alexa Chung wrote her message in red lipstick on a mirror and posted the picture online.

Singer Wyclef Jean wrote, "Children are the reward of life. Rescue our Nigerian sisters. The world is watching, Make your voice heard. Retweet! BringBackOurGirls".

Public figures have also joined in the campaign, including U.S. First Lady Michelle Obama, Hillary Clinton, and teenager Malala Yousafzai, who was shot for campaigning for women's education rights in Pakistan.