Kevin Mazur/Getty Nick Lachey and Vanessa Lachey ... marked their 13th wedding anniversary. "13 years walking by your side!" Nick, 50, wrote on Instagram beside two photos of the couple walking ...

"Every single issue we had, every issue I brought up — to find that person, that I can trust and that can carry me through is what made us unstoppable," Vanessa admitted on 'The Ultimatum ...