Celebrities line up to support Newton-John charity walk

Comedienne Joan Rivers, actress Jane Seymour and singer Cliff Richard are among the stars signing up to support Olivia Newton-John's charity trek in China.

The actress/singer is embarking on a 21-day, 228-kilometre (141-mile) trip - dubbed the 'Great Walk To Beijing' - across the Great Wall Of China to raise funds for the Wellness Centre at the Austin Hospital in Melbourne, Australia.