Natalie Portman

Natalie Portman has been named the most eco-friendly star, after topping a list of celebrities who go out of their way to care for the planet.

The Hollywood beauty won a special mention by campaigners at green website Grist.org - who praised her work to save gorillas in Rwanda, her role as the face of a low-energy lightbulb company and the launch of her vegan shoe range.

Other stars to be honoured by the planet-friendly firm include Leonardo DiCaprio, Cameron Diaz, Julia Roberts and Brad Pitt.

However, organisers singled out a handful of A-listers as particularly non-environmentally friendly.

The worst offenders were named as David Beckham, for the amount of flights he takes annually; British model Elizabeth Hurley, for flying 250 guests to her 2007 wedding in India, and the Spice Girls, for their use of private jets.