Celebrity do-gooders: Selena Gomez, Lady Gaga, Mark Wahlberg and more

John Oliver, host of HBO's

John Oliver, host of HBO's "Last Week Tonight," acquired $15 million worth of unpaid medical bills for only $60,000, and immediately forgave the debts. Oliver was illustrating a story on his show Sunday, June 5, 2016, about an industry that purchases the records of people delinquent in bills and attempts to collect. (Credit: AP/ Greg Allen)

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From Selena Gomez to James Taylor, these celebrities use their star power for good by helping others through their various organizations and other acts of kindness.

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