Mary J. Blige sings for Justice in “Rock of Ages”

Grammy-winning R&B singer Mary J. Blige has always sung from her heart, telling of personal struggles on albums such as “No More Drama” and “Stronger with Each Tear.” She also has dabbled in acting with guest roles on TV’s “Ghost Whisperer” and in the Tyler Perry film “I Can Do Bad All By Myself.”

On Friday, her acting and singing skills will both be on display in her most high-profile film role yet – Justice, owner of the Venus Gentlemen’s Club in the rock musical “Rock of Ages.”

In the adaptation of the Broadway musical, Blige belts out tunes like Journey’s “Any Way You Want It” and Pat Benatar’s “Shadows of the Night” while taking in an aspiring young singer named Sherrie (Julianne Hough) whose own Hollywood dreams have hit a low point.