The Hollywood star - who is the Vice Chairman of environmental group Conservation International - underwent the hair removal treatment in a bid to shock people into going 'green'.
Afterwards, the 65-year-old star reportedly remarked he felt "naked".
The 'Indiana Jones and the Kingdom of the Crystal Skull' actor was joined during his treatment by Spice Girl Mel B, who was reporting for US TV show 'Access Hollywood'.
Harrison - who has worked with Conservation International for 15 years - was handed the Global Environmental Citizen Award in 2002 by Harvard University in recognition of his conservation campaigning.
Speaking at the time, he said: "Our exploitation of the Earth has reached alarming proportions in the short time we've come to dominate the environment."
Conservation International operates in more than 40 countries to combat climate change, protect endangered species and assist local and indigenous communities.
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