Stars Enjoy the Great OutdoorsRelated: Out and About, Ashlee Simpson, Ellen Pompeo, Naomi Watts, Rachel Bilson, Jessica Alba, Naomi Campbell
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In honor of Earth Day, see how your favorite celebs are enjoying the great outdoors.
Mark Wahlberg steps outside to show off his natural talent of posing in boxer briefs while filming "Pain and Gain" in Miami on April 17, 2012.
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