He popped the question with a 4 carat Asscher-cut diamond and platinum engagement ring, and it's a rock!
But in a strange turn of events, Lachey won't be the only ex-Newlyweds star to walk down the aisle in the near future... Jessica Simpson just announced that she, too, is engaged!
Simpson's ex-NFL beau Eric Johnson picked an on-trend engagement ring for his soon-to-be wife-- a three-stone Neil Lane stunner featuring a ruby as the center stone.
So... who do you think will walk down the aisle first, Jessica & Eric, or Nick & Vanessa?? And if you had to put money on the staying power of one of the two couples, which couple would it be?? Dish it in the comment section below!