The cast of “Sister Wives” during a 2010 panel discussion in Beverly Hills. (Frederick M. Brown/ Getty Images)

The “Sister Wives” clan is going to court to fight for their right to polygamy — with the help of D.C. law professor Jonathan Turley. Turley will file a lawsuit in Utah’s federal court Wednesday on behalf of Kody Brown and his four wives, members of a fundamentalist branch of the Mormon Church and stars of the TLC reality series.

Brown is legally married to only one of the women, and has 16 children with them. They all moved to Nevada in January after Utah officials began a bigamy investigation. “While we understand that this may be a long struggle in court, it has already been a long struggle for my family and other plural families to end the stereotypes and unfair treatment given consensual polygamy,” Brown said in a statement on Turley’s web site.

Turley is not asking the state to recognize polygamy, just challenging its right to prosecute lifestyle choices. “I have long argued against these type of laws that criminalize private relations between consenting adults,” he told us. And yes — he’s representing the Browns pro bono.