Chris Martin, Lily Allen and Alesha Dixon are among celebrities urging volunteers to become "dementia friends" and help care for those with the degenerative condition.
Volunteers who take part in the scheme will be able to attend free sessions to learn how to spot the signs of dementia and offer support for sufferers, the Alzheimer's Society said.
In a new ad which will be aired for the first time tonight, the pop stars will be seen performing The Beatles' track I Get By With A Little Help From My Friends.
Other celebrities involved in the ad include comedian Simon Pegg, actor Ray Winstone, footballer Leighton Baines and presenter Paul O'Grady.
More top news
Debates are often lively on ITV News, but when two siblings joined Alastair Stewart for a piece on milk allergies, it all turned a bit sour.
An NHS trust declined the £2,500 raised by a group of men dressed up as female nurses saying the costumes were "insulting".
The Three Lions record goalscorer has revealed why he turned down the opportunity to add to his 119 caps and revealed his lasting regret.