The 42-year-old star initially asked the "Magic Mike XXL" actor, 38, to tie the knot with her at a "small" ceremony in Las Vegas but then she changed her mind because he's never been married before, reported Female First.
"I said, 'Joe let's just go to Vegas,' because I wanted a small wedding, but then I thought it has to be super-special for Joe because it's his first wedding. So, it's going to have to be big!"
This will be Vergara's second marriage as she was previously married to Joe Gonzalez, with whom she has her son, 23-year-old Manolo.
No date is set for the couple's wedding, but they plan to get married sometime this year.