The Monster-in-Law star proposed to Lauren Skaar earlier this month (Mar10) and they are preparing to exchange vows next year (11).
And Vartan, who previously dated his Alias co-star Jennifer Garner, admits he's heavily involved in making sure the big day runs smoothly.
He tells America's OK! magazine, "I feel wonderful! I feel very blessed. I feel like it’s about God damned time I met someone special. I’m excited about throwing an engagement party, I’m excited about choosing the bridesmaid dresses, and what kind of knives and food.
"The hardest thing about planning a wedding is where you’re going to seat the people! Who’s going to be seated with who. It’s like playing chess. You can put your family with whoever and they’ll be fine, but then those people in the middle. Are they going to get along?”