Diane Lane, Piper Perabo, and Amber Valletta joined Jane's force of environmental protesters in Washington D.C. Friday for a demonstration at the Supreme Court building ... and got hauled off in cuffs after refusing police orders to move.
Before they were taken away, Diane and Amber told us it was their first time being arrested ... number 2 for Piper. "The Good Place" actor Manny Jacinto was also on hand but didn't get arrested.
We're told the folks behind FDF with Fonda are making sure she avoids her 5th arrest because it could result in serious consequences ... and they want her to be able to remain the weekly face of the movement.
Lane, Perabo and Valletta can now wear an arrest badge of honor with Fonda, along with other Hollywood pals who've joined her ... like Sam Waterston, Ted Danson, Rosanna Arquette and Catherine Keener. Ben & Jerry