Justin Bieber, Maroon 5 and the Backstreet Boys are among the stars who are urging their fans to donate money to a charitable fund to provide hospital treatment for three children orphaned in a fatal car crash.
The Joshua and Robin Berry Children's Trust was set up in the couple's name after they were killed on July 3 while driving home to Houston, Texas following a family vacation in Colorado.
Their three kids - Peter, nine, Aaron, eight, and daughter Willa, six - survived the tragic accident, but the boys were left with severe spinal cord injuries and are now paralysed below the waist.
Organizers of the Children's Trust aim to raise money to pay for the kids' medical needs and future education, and every donor has been gifted with a free Twitter.com avatar featuring the heart-shaped artwork of their Show Your Hearts campaign.
Singer Nicole Scherzinger, New Kids On The Block stars Joey McIntyre and Donnie Wahlberg, Nick Lachey, Smashing Pumpkins, boxer Mike Tyson and reality TV star Khloe Kardashian have all made donations and uploaded their special icon images to encourage fans to do the same.
And Bieber has personally thanked devotees for uniting for such a worthy cause.
In a post on his blog, he writes, "Seeing u all come together for #showyourhearts is pretty amazing. keep donating and spreading the word. super grateful and proud of my fans."