Jamie Lynn Spears

Although this perpetually perky singer/actress started out riding on the sequined coattails of her older sister, pop superstar Britney, Spears has managed to carve out her own career without displaying much talent. The spitting image of her famous sibling, Spears appeared in a few of her sis' projects before landing a spot on Nickelodeon's juvenile improvisational sketch-comedy series All That. After the show ended, the network gave Spears her own vehicle, the inexplicably popular tween-oriented sitcom Zoey 101, in which she mugged her way through a string of misadventures.  In 2007, the 16-year-old stunned when she announced her pregnancy, showing that this Spears hadn't completely escaped the life of turmoil and controversy that plagued her older sister.