Justin Bieber has put his celebrity to good use and appeared as the special guest on the American show 'Extreme Makeover: Home Edition'. 

The 'Baby' star turned up to help out a family in need and told them that he would donate one dollar from every ticket sold at that night's concert to their cause that works to raise awareness of the dangers of texting and driving, which caused the death of one of their daughters. He signed the don't text and drive pledge and also tweeted Katrina, the young girl from the family, a message before the show aired yesterday (January 30) that said:

"i will see u and your amazing family on Extreme Home Makeover in 1 hour. really glad I met you guys"

"Im really happy for u and ur family. see u at the premiere. keep up the incredible work!!"

You can watch a clip from the episode here: