TMZ has a special investigative report on underage Hollywood stars and their hard partying ways. The website has pictures and footage of several young celebrities like Lindsay Lohan, Mary Kate Olsen, Jesse McCartney and Frankie Muniz drinking and attending clubs they’re too young to get into. While this kind of partying is nothing new for hot teen stars like Lindsay and Mary Kate , who’s attendance gives any club a boost; it’s a major coup for teen squirts McCartney and Muniz who probably have to tell their friends to "just go in without me" fairly often. We’d like to give both Jesse and Frankie the requisite high five for finally making it past the bouncer. You go l’il bros!