The New Kids on the Block singer had been checking out wedding rings for more than four years, but it was watching his longtime love, fitness trainer Harley Rodriguez, dangle over a death-defying waterfall that prompted the star to finally pop the question.
"We were walking around Victoria Falls, and there's this thing called Devil's Pools," says Knight, who was holidaying in Africa with Rodriguez, their mothers and friends. "It's ridiculous -- you walk to the edge of a waterfall and then it drops straight down and it just didn't make any sense to me, so I didn't do it, but Harley did. In the back of my mind I'm like, 'If he's hanging off a waterfall, I could frickin' lose him! It's time to do it.'"