Wannabe pop star Heidi, 21, is prepping for worldwide fame as she moves forward from her homemade music video, “Higher,” to her next professionally mastered single, which is being recorded this month. “The next thing is to really focus on her new music and get her onstage and on a world tour,” Spencer, 24, who is also Heidi’s manager, tells In Touch. Although Heidi considers herself an original act, she plans to take performance cues from some of the world biggest superstars, like Britney Spears, Madonna and Michael Jackson, says Spencer. “What we want for Heidi is for her to perform like they do,” Spencer reveals to In Touch. “She could have these huge, unbelievable, explosive performances, with pyrotechnics and lots of costume changes.” “Heidi isn’t going to let what people say stop her from being a huge star,” Spencer tells In Touch.