Shailene Woodley has been arrested during a protest against a pipeline in southern North Dakota.
Morton County Sheriff's Department spokesman Rob Keller said the Divergent star was arrested on Monday for criminal trespass and engaging in a riot during a protest at a construction site that involved about 300 people.
Both charges are misdemeanours that carry a maximum punishment of 30 days in jail and a 1,500 dollars (£1,200) fine.
Shailene's publicist did not immediately comment.
Keller said 27 people were arrested during protests at two construction sites that prompted the shutdown of a state highway for several hours. No injuries were reported.
The Dakota Access pipeline is being built by Dallas-based Energy Transfer Partners and will cross through North Dakota, South Dakota, Iowa and Illinois.