The 29-year-old Grey's Anatomyactor tied the knot in Italy over the weekend, marrying Nichole Gustafson after popping the question in November 2017. The pair's ceremony was at Villa Pocci in Marino, Italy, which overlooks Castel Gandolfo, a scenic town in Rome.
Gianniotti shared the happy news on Instagram, writing a sweet message to both his bride and the people who made his wedding day possible.
"Huge thank you to the incredible team that gave us the most incredible wedding we are forever indebted to you for making this day a dream come true," he gushed alongside a glowing pic of the pair following their nuptials. "We are still floating. To all our friends and family who came, we love you and we will never forget you."
The actor's on-screen love interest, Ellen Pompeo, as well as his Grey's sister, Stefania Spampinato, commented on the post with heart emojis.
Gustafson, a makeup artist, shared the same pic on her Instagram, calling her groom "oh so handsome." Gianniotti opted for a classic tuxedo by Armani for his wedding day, while Gustafson stunned in an off-the-shoulder, mermaid-style gown by Netta BenShabu Bridal.
ET caught up with Gianniotti last month, and he revealed that marriage is "not something I necessarily dreamed of doing."
"I wouldn’t consider myself a totally traditional person in the past," he said. "It was a newer concept that came to us, but when it came around, it felt so right and it fit."
Following his proposal -- which came after he flew to northern California to ask for his future father-in-law's permission -- Gianniotti was "pretty blown away by how much it changes things, and positively."
"It’s like an unexplainable energy shift when you really commit yourself to someone and make it official. It’s beautiful," he said. "I think it's just recognizing a similar soul -- a soul that feels like yours. [It’s] easy. When things are easy and don’t have to be complicated, and you feel like you can both chase your own goals, but still be running together, that’s a really exciting thing for me."