Rihanna, Swift, Gomez back Unicef water campaign

London: Singers Rihanna Taylor Swift and Selena Gomez are backing a campaign to force restaurant owners to charge for tap water to help fund clean drinking water around the world.

A website reports, the singers have added their name to Unicef`s tap water project, which urges restaurant owners to ask diners to pay $1 for tap water they would usually receive for free.

In one of the advertising posters highlighting the scheme, Rihanna poses next to a bottle of her personalised drink with the words: "Rihanna Tap Water. Not your typical tap water, unless of course, you live next door to Rihanna."

A message on the Unicef website read: "Celebrities have donated their own tap water to help raise awareness of the world water crisis. Donations enter individuals in our sweepstakes to win an esteemed collection of these famous tap waters."