Chris Hemsworth Apologizes for Dressing Up as a Native American: 'I Was Stupidly Unaware of the Offense'

Just days before Halloween, Chris Hemsworth shares his biggest costume regret.

On Thursday, the 33-year-old actor posted a photo of himself dressed as his Avengers character posing alongside Thor: Ragnorak's director Taika Waititi. In the caption, Hemsworth announced that he would be supporting the Standing Rock protests in the U.S. "Standing with those who are fighting to protect their sacred land and water. #nodapl #waterislife #mniwiconi @taikawaititi," he wrote.

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Hemsworth also expressed his deep regret for once dressing up as a Native American. "I would also like to take this opportunity to raise something that has been bothering me for sometime. Last New Year's Eve I was at a Lone Ranger-themed party where some of us, myself included, wore the traditional dress of First Nations people," he explained. "I was stupidly unaware of the offense this may have caused and the sensitivity around this issue. I sincerely and unreservedly apologize to all First Nations people for this thoughtless action."

The father of three added, "I now appreciate that there is a great need for a deeper understanding of the complex and extensive issues facing indigenous communities. I hope that in highlighting my own ignorance I can help in some small way."

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Hemsworth isn't the only celebrity who's protesting the Dakota Access Pipeline that's being built at the Standing Rock Indian Reservation in North Dakota. His Avengers co-star, Mark Ruffalo, has also joined the efforts and Shailene Woodley was recently arrested for protesting at the site of where the pipeline is to be built.

"For me, it's not about helping the environment or saving the environment," the 24-year-old actress told ET after her arrest. "It's about recognizing that if I want my children to know a world where Manhattan isn't all the way under water -- because guess what, ladies and gentlemen, that world is not too distant and it's a reality that we must start facing and waking up to -- [then] we've gotta work our a**es off now to make that happen."

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