A highly attractive actress and singer who first came to national prominence as Judy Hoffs, one of the young undercover cops on "21 Jump Street" (Fox, 1986-90), Holly Robinson Peete has since gone on to co-star as Vanessa Russell, Mark Curry's somewhat ditzy roommate on the long-running ABC sitcom "Hangin' With Mr. Cooper" (1992-97) and as a newlywed in the treacly sitcom "For Your Love" (NBC, 1998; The WB 1998- ).Robinson was born into a show business family. When she was a girl, her mother, Dolores Robinson, was working in public relations for a TV station in Philadelphia and her father,