Nick Lachey

Biography: This hunky singer was studying sports medicine when he dropped out of college to join the vocal group 98 Degrees. His gamble paid off---even if the outfit wasn't the most successful of the wave of late-'90s boy bands. In 2002, Lachey raised his profile considerably by marrying pop princess Jessica Simpson. Together the couple launched the wildly popular MTV reality series Newlyweds: Nick and Jessica in 2003, which featured Lachey suffering his bride's addle-brained antics. Although both their stars were on the rise with acting gigs and a handful of prime-time variety specials, the couple split in 2005, and Lachey began dating TV personality Vanessa Minnillo the following year. Post-Newlyweds, Lachey has kept busy with music-related TV work, hosting the reality competitions The Sing-off and High School Musical: Get in the Picture, as well as coaching competitors on NBC's Clash of the Choirs.