Happy 51st birthday to the one and only Nick Lachey! It seems like just yesterday you were serenading us with "I Do" and now you're celebrating another trip around the sun. You may have turned 51, but let's be real, you still look like you're in your 20s. Cheers to another year of making us swoon with your vocals and dance moves. Here's to hoping your birthday is full of love, laughter, and plenty of boy band throwbacks. Keep on shining, Nick!