After dating for less than a year, these crazy kids announced their engagement in March 2009. But Kelly's parents urged the couple, who were 24 and 19 at the time, to wait before walking down the aisle. "I keep telling them, 'Don't rush. Wait. You've made a commitment ... but you've got to enjoy acting your age,'" Sharon Osbourne told U.K.'s Daily Mail in 2009. So Kelly and her model fiance decided to wait until he turned 21 -- so he could drink legally in the U.S., natch. Good thing they did, though, because it turns out Luke was a cheater! The couple split in July 2010.