Kind-hearted Orlando Bloom is fronting a campaign to improve education for poor children in Madagascar.

The Hollywood star and UNICEF Goodwill Ambassador has partnered with actress Sienna Miller for the BOSS Orange Education Campaign For UNICEF.

Every purchase of the company's limited edition fragrance, Today. To Help. Together, will fund a day of school for 50 disadvantaged children.

Bloom says, "I feel very privileged to be working with BOSS Orange and UNICEF on this partnership. Witnessing first-hand the difference it makes to the lives of children in Africa is truly humbling."

Bloom's wife Miranda Kerr has also shown her charitable side by signing up as a global ambassador for Earth Hour 2012, which encourages the public to switch off their lights for 60 minutes on March 31st to conserve energy and encourage sustainability.