The couple lends their star power to a charity event in L.A. Plus: Lady Gaga, Mark Salling, John Krasinski & Emily Blunt, Rihanna and more

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LOVING CUPS

They're the couple that keeps on giving! After celebrating the opening of their new Los Angeles playground on Tuesday, Nicole Richie and Joel Madden join 7-Eleven to kick off their new "Coffee Cup with a Cause" campaign. The promotion encourages customers to purchase a reusable coffee cup designed by a celeb, with proceeds benefiting that star's favorite charity.