This is actress Nicholle Rochelle, who appeared on a few episodes The Cosby Show and is a member of European feminist group Femen (known for staging topless protests).
According to Associated Press, she appeared topless with 50+ of Bill Cosby’s accusers names written on her body at his sexual assault retrial on Monday, stating:
"The main goal was to make Cosby uncomfortable because that is exactly what he has been doing for decades to women"
She lept over a barricade and ran toward Cosby, but was apprehended. She claims she had no intention of touching him and that she will stay away from future sessions at the courthouse, as she was ordered to do.