Houston Texans star Kenny Stills was one of nearly 100 people arrested during a protest in Louisville on Tuesday ... and the WR took his mug shot in a Breonna Taylor shirt.
The 28-year-old NFL player joined 86 others in a massive protest outside the home of Kentucky Attorney General Daniel Cameron to seek justice for Taylor.
As part of the demonstration, the group of people -- which included "Real Housewives Of Atlanta" star Porsha Williams -- sat on Cameron's lawn and chanted ... urging him to levy charges against the cops involved in Taylor's tragic death.