Which reality series followed a family consisting of Kim, Khloé, and Kourtney?

Which 'American Idol' winner became a country music superstar after winning Season 4? Who has hosted 'American Idol' since its first season? Which reality show features contestants voted off an island, with host Jeff Probst? Which reality show features teams racing around the world, hosted by Phil Keoghan? Which reality competition features drag queens competing, hosted by RuPaul? Which reality show pairs celebrities with professional dancers? Which reality show features a bachelor choosing a wife from many contestants? Which cooking competition features chef Gordon Ramsay yelling at contestants in a restaurant kitchen?