Manganiello posted a picture of himself dancing with his wife and wrote, "Feliz primer aniversario al amor de mi vida," which translates to, "happy first anniversary to the love of my life."
Vergara shared similar sentiments, writing, "Happy first anniversary love of my life. Nothing compares to you."
The "Modern Family" star, 44, wed the former "True Blood" actor, 39, following an 11-month engagement. They were first linked in the summer of 2014, just a few months after they met at the White House Correspondents' Dinner that March.