Exhibiting her rock hard body while crooning her heart out,  Fergie rocking at the “NCAA Big Dance” sequence of free gigs along the Detroit Riverfront on April 5.

The “Big Girls Don’t Cry” songstress appeared appealing in thigh high black boots paired with black hot pants and a glittering blue top beneath a black zip up vest while rocking the stage.

The 34-year-old mesmerized the swarm of fans with her soaring oomph and marvelous singing; propelling up the crowd ahead of tonight’s NCAA Championship game.

Gym Class Heroes, Staind and Janelle Monae were among the other bands that performed as part of the Final Four festivities.