Ian Somerhalder at the 2013 Game Changer Awards | Pictures

Ian Somerhalder lent his name to a charitable cause last night at the Natural Resources Defense Council's Game Changer Awards in NYC. Ian, who showed up in a suit to walk the red carpet at the ceremony, has long been involved with environmental causes. In fact, before attending the event at the Mandarin Oriental hotel, Ian stopped by POPSUGAR's NYC offices to talk about his latest efforts. Ian's partnered with LED company Cree, which is developing lightbulbs that he says use 84 percent less energy than standard incandescent bulbs. We also chatted with Ian about the future of The Vampire Diaries — stay tuned for our full interview!

While Ian tended to a packed schedule on the East Coast, his girlfriend, Nina Dobrev, stayed busy on the West Coast. On Wednesday, she attended a luncheon celebrating The Hollywood Reporter's list of top 25 stylists, which included her own stylist, Ilaria Urbinati.