Taylor Lautner, Kristen Stewart, and Robert Pattinson were relative unknowns until the "Twilight" movie hit theaters in November 2008. Now they're swarmed by fans wherever they go. At Comic-Con 2009, people were camping overnight in line just to catch a glimpse of them! Chelsea Lauren/WireImage.com - July 23, 2009
From Lady Gaga to the Jonas Brothers, check out this gallery of performers who became famous seemingly overnight.